16. The system of claim 9 , wherein the first suggested query is associated with search results having an associated measure of diversity with the plurality of search results responsive to the initial query, the measure of diversity satisfying a diversity threshold.
9. A system comprising: one or more computers and one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising: receiving an initial search query; obtaining a plurality of search results responsive to the initial search query, the search results including a first search result that identifies a first resource, the search results including a second search result that identifies a second resource different from the first resource; determining, using a document-to-query-to-document model, that the first resource is relevant to a first suggested query different from the initial search query; determining, using the document-to-query-to-document model, that the second resource is relevant to a second suggested query different from the initial search query and different from the first suggested query; generating a presentation of the search results responsive to the initial search query, wherein each search result in the presentation includes a link to a respective resource, wherein the first search result in the presentation includes a link that, upon a selection by a user, can cause the first suggested query to be submitted to a search engine, and wherein the second search result in the presentation includes a link that, upon a selection by a user, can cause the different second suggested query to be submitted to the search engine; and providing the presentation of the search results in response to the initial search query.