7. A search system comprising: a client system including one or more processors configured to present, to a querier, a single interface that includes two mechanisms for specifying search terms for the same query in two different manners; wherein the first mechanism includes first controls for receiving a query string from the querier; wherein the second mechanism includes second controls for selecting one of a plurality of selectable items; wherein each selectable item of the plurality of selectable items corresponds to a filter record of a plurality of filter records; wherein said first controls allow the querier to enter one or more search terms that comprise the query string; wherein the second controls allow the querier to specify which filter record, of the plurality of filter records, to use to generate an amended query string based on said query string, at least one server system configured to receive a request from the querier, wherein the request includes receiving a first set of search terms from the querier through said first controls and receiving, through said second controls, a selection of a selectable item; the at least one server system configured to determine, based on the request indicating the selection of the selectable item, that a selected filter record should be used to process the request, wherein the selected filter record corresponds to the selectable item that was selected through said second controls and includes a set of filter elements that correspond to a second set of search terms; a search filter configured to add, to the first set of search terms, search terms that correspond to the filter elements associated with the selected filter record to generate said amended query string that includes both the first set of search terms and the second set of search terms; and a search engine including one or more processors configured to perform a document-corpus search of a document-corpus by treating the second set of search terms as if they were a part of said first set of search terms submitted through said first controls, to identify documents relevant to both the first set of search terms and the second set of search terms; wherein the search engine is configured to perform the document-corpus search by comparing both the first set of search terms and the second set of search terms to terms contained in documents that belong to the document-corpus.
9. The search system of claim 7 , wherein the search filter is a module of the client system.