1. A computer-implemented method comprising: determining, by a computer system, a score for a document as a result for a search query, the score based, at least in part, on one or more related search queries that have at least a threshold relationship to the search query, wherein determining the score comprises: identifying click data associated with the document and the one or more related search queries, wherein the click data indicates how frequently the document was selected when the document was presented in search results for the one or more related search queries over a period of time; weighting the click data based on weights for the one or more related search queries, wherein the weights indicate how strongly the one or more related queries are related to the search query; and combining the weighted click data to generate at least a component of the score; and providing, by the computer system, the score for the document as a result for the search query.