1. A method for providing search results, comprising: receiving a search query; determining a plurality of preprocessing functions to be performed on the search query, based at least in part on a search label corresponding to the search query; performing the plurality of preprocessing functions on the search query to obtain a plurality preprocessed search queries; generating, based at least in part on precision levels associated with the plurality of preprocessed search queries, a search plan comprising a selected preprocessed search query; and inputting the search plan to the search engine to obtain the search results.