SEARCH ENGINE WITH EFFICIENT CONTENT REFIND AND DISCOVERY

Aspects of the technology described herein leverage usage data of content items to facilitate returning search results relevant to a user's intent. A search engine enables a user to select from one of three filter options: a first filter option for the user's own content items, a second filter option for content items previously accessed by the user, and a third filter option for content items new to the user. In response to selection of one of the filter options, the search engine identifies and returns search results based at least in part on correspondence between usage data for content items and the selected filter option. In some aspects, the search engine may automatically select one of the filter options based on search context and provide the selected filter option as a filter suggestion.