Finding indexed documents is described herein, including: extracting a character string from the search query and segmenting the character string into a plurality of search terms, wherein each search term comprises one or more search words; retrieving indexed document sets corresponding to search words included in the plurality of search terms; processing the retrieved indexed document sets associated with a first search term of the plurality of search terms based at least in part on a selection operation, wherein processing results of the retrieved indexed document sets associated with the first search term comprise search results for the first search term; performing set intersection operations on search results corresponding to the plurality of search terms to generate a results document set; and determining and returning a first subset of indexed documents of the results document set that each includes each of the plurality of search terms.