12. A system comprising: one or more data processing apparatus; and a computer-readable storage device having stored thereon instructions that, when executed by the one or more data processing apparatus, cause the one or more data processing apparatus to perform operations comprising: obtaining a plurality of first search results responsive to a first search query, the plurality of first search results being ranked in an order; obtaining one or more second search results responsive to a second search query, the second search query being related to the first search query; identifying a particular search result of the second search results; determining that the particular search result is related to the first search query and that the particular search result is highly ranked for the second search query; determining that the particular search result is not within a threshold number of highest-ranked first search results of the first search results responsive to the first search query; in response to determining that the particular search result is highly ranked for the second search query and the particular search result is not within a threshold number of highest-ranked first search results of the first search results responsive to the first search query, modifying the first search results by providing the particular first search result within the threshold number of highest-ranked first search results of the first search results responsive to the first search query; and providing the modified plurality of first search results in response to the first search query.
13. The system of claim 12 , wherein the operations further comprise: determining the second search query is related to the first search query based on a temporal relationship between the first search query and the second search query.