diff --git a/src/search/AdvancedSearchManager.ts b/src/search/AdvancedSearchManager.ts
new file mode 100644
index 0000000..b85484f
--- /dev/null
+++ b/src/search/AdvancedSearchManager.ts
@@ -0,0 +1,146 @@
+// set up environment
+import * as dotenv from 'dotenv';
+dotenv.config();
+
+import { CveResult } from '../result/CveResult.js';
+import { SearchResultData } from "./SearchResultData.js";
+import { BasicSearchManager, SearchOptions } from "./BasicSearchManager.js"
+
+export class SearchAPIOptions extends SearchOptions {
+  searchFields: Array<string>;
+  filters: Array<object>;
+  resultsPerPage: number;
+  pageNumber: number;
+  rangeObjects: Array<rangeObject>
+  rangeStart: Date;
+  rangeEnd: Date;
+  rangeField: string;
+}
+
+//support for date ranges
+export class rangeObject {
+  rangeField: string;
+  rangeStart: Date;
+  rangeEnd: Date;
+}
+
+export class AdvancedSearchManager extends BasicSearchManager {
+  /** search for text at search provider
+   *  @param searchText the text string to search for
+   *  @param options options to specify how to search, with well-defined defaults
+   *  @param queryString query strings for each filter on the search request
+   */
+  async apiSearch(searchText: string, options: Partial<SearchAPIOptions> = undefined, queryStrings?: Array<object>): Promise<CveResult> {
+     let response = undefined;
+
+    if (!options) {
+      options = {
+        useCache: true,
+        searchFields: null,
+        filters: null,
+        resultsPerPage: 20,
+        pageNumber: 0,
+        rangeObjects: null,
+        rangeStart: null,
+        rangeEnd: null,
+        rangeField: null,
+        track_total_hits: true,
+        default_operator: "AND",
+        metadataOnly: false,
+        fields: []
+      };
+    }
+
+    const validateResult = this.validateSearchText(searchText, options.filters)
+
+    //Build range object to add to the query
+    // let rangeObj = null;
+    const rangeArray = [...(options.rangeObjects ?? [])];
+
+    // if (options.rangeObjects) {
+    //   options.rangeObjects.forEach(rangeObject => {
+    //     rangeObj = {
+    //       range: {
+    //         [rangeObject.rangeField]: {
+    //           "gte": rangeObject.rangeStart,
+    //           "lte": rangeObject.rangeEnd,
+    //         }
+    //       }
+    //     };
+    //     rangeArray.push(rangeObj);
+    //   })
+
+    // }
+    //Build query object
+    const queryObj = {
+      must: [],
+      filter: [
+        ...options.filters
+      ],
+    };
+
+    //Add rangeObj only if it exists
+    if (rangeArray) {
+      queryObj.filter.push(...rangeArray);
+    }
+
+    if (searchText != null) {
+      queryObj.must = [
+        {
+          query_string: {
+            query: searchText,
+            fields: ["containers.cna.descriptions.value"]
+          },
+        }
+      ];
+    }
+
+    //Add query_string only if there is text to search
+    else if (queryStrings != null) {
+      queryObj.must = [
+        ...queryStrings
+      ];
+    } else {
+      delete queryObj.must
+    }
+   
+    if (validateResult.isOk()) {
+
+      response = await this._searchReader._client.search({
+        index: this._searchReader._cveIndex,
+        body: {
+          query: {
+            bool: queryObj
+
+          },
+          track_total_hits: true,
+          size: options.resultsPerPage,
+          from: options.pageNumber
+        }
+      });
+
+      return CveResult.ok(response.body as SearchResultData);
+    }
+    else {
+      // return CveResult.error(new CveError(1, `Unknown error when searching for ${text}`));
+      return validateResult
+    }
+  }
+
+  /** validates search text string and marks up CveResult
+   *  with errors and/or notes, if any
+   */
+  // @todo
+  validateSearchText(text: string, filters: Array<object>): CveResult {
+
+    let result: CveResult
+    if (!text && !filters) {
+      result = CveResult.error(9002)
+    }
+    else {
+      result = CveResult.ok("", ["no validation was done"])
+    }
+
+    return result
+  }
+}
diff --git a/src/search/BasicSearchManager.ts b/src/search/BasicSearchManager.ts
index 2392463..c725641 100644
--- a/src/search/BasicSearchManager.ts
+++ b/src/search/BasicSearchManager.ts
@@ -2,11 +2,10 @@
 import * as dotenv from 'dotenv';
 dotenv.config();
 
-import { CveErrorCodes, CveResult } from '../result/CveResult.js';
+import { CveResult } from '../result/CveResult.js';
 import { SearchProviderSpec } from '../adapters/search/SearchAdapter.js';
 import { SearchQueryBuilder } from './SearchQueryBuilder.js';
 import { SearchReader } from '../adapters/search/SearchReader.js';
-import { SearchResultData } from "./SearchResultData.js";
 
 
 /** options when using search() 
@@ -21,26 +20,8 @@ export class SearchOptions {
   sort: {}[];
   from: number;
   size: number;
-
-}
-
-export class SearchAPIOptions extends SearchOptions {
-  searchFields: Array<string>;
-  filters: Array<object>;
-  resultsPerPage: number;
-  rangeObjects: Array<rangeObject>
-  rangeStart: Date;
-  rangeEnd: Date;
-  rangeField: string;
 }
 
-//support for date ranges
-export class rangeObject {
-  rangeField: string;
-  rangeStart: Date;
-  rangeEnd: Date;
-
-}
 
 /** A manager class that provides basic search capabilities 
  *  including a flexible search() that provides consistent
@@ -86,121 +67,4 @@ export class BasicSearchManager {
     return result
   }
 
-  /** search for text at search provider
-   *  @param searchText the text string to search for
-   *  @param options options to specify how to search, with well-defined defaults
-   */
-  async apiSearch(searchText: string, options: Partial<SearchAPIOptions> = undefined, queryStrings?: Array<object>): Promise<CveResult> {
-     let response = undefined;
-
-    if (!options) {
-      options = {
-        useCache: true,
-        searchFields: null,
-        filters: null,
-        resultsPerPage: 20,
-        rangeObjects: null,
-        rangeStart: null,
-        rangeEnd: null,
-        rangeField: null,
-        track_total_hits: true,
-        default_operator: "AND",
-        metadataOnly: false,
-        fields: []
-      };
-    }
-
-    let validateResult = this.validateSearchText(searchText, options.filters)
-
-    //Build range object to add to the query
-    let rangeObj = null;
-    let rangeArray = [];
-
-    if (options.rangeObjects) {
-      options.rangeObjects.forEach(rangeObject => {
-        rangeObj = {
-          range: {
-            [rangeObject.rangeField]: {
-              "gte": rangeObject.rangeStart,
-              "lte": rangeObject.rangeEnd,
-            }
-          }
-        };
-        rangeArray.push(rangeObj);
-      })
-
-    }
-    //Build query object
-    const queryObj = {
-      must: [],
-      filter: [
-        ...options.filters
-      ],
-    };
-
-    //Add rangeObj only if it exists
-    if (rangeArray) {
-      queryObj.filter.push(...rangeArray);
-    }
-
-    if (searchText != null) {
-      queryObj.must = [
-        {
-          query_string: {
-            query: searchText,
-            fields: ["containers.cna.descriptions.value"]
-          },
-        }
-      ];
-    }
-
-    //Add query_string only if there is text to search
-    else if (queryStrings != null) {
-      queryObj.must = [
-        ...queryStrings
-      ];
-    } else {
-      delete queryObj.must
-    }
-   
-    if (validateResult.isOk()) {
-
-      response = await this._searchReader._client.search({
-        index: this._searchReader._cveIndex,
-        body: {
-          query: {
-            bool: queryObj
-
-          },
-          track_total_hits: true,
-          size: options.resultsPerPage
-        }
-      });
-
-      return CveResult.ok(response.body as SearchResultData);
-    }
-    else {
-      // return CveResult.error(new CveError(1, `Unknown error when searching for ${text}`));
-      return validateResult
-    }
-  }
-
-  /** validates search text string and marks up CveResult
-   *  with errors and/or notes, if any
-   */
-  // @todo
-  validateSearchText(text: string, filters: Array<object>): CveResult {
-
-    let result: CveResult
-    if (!text && !filters) {
-      result = CveResult.error(9002)
-    }
-    else {
-      result = CveResult.ok("", ["no validation was done"])
-    }
-
-    return result
-  }
-
-
 }
\ No newline at end of file