11. The system of claim 9 , wherein 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 comprises: obtaining a first plurality of previously submitted search queries, each of the first plurality of previously submitted search queries being associated with the first resource identified by the first search result; and selecting a first query from the first plurality of previously submitted search queries as the first suggested query, the first query having at least one term that does not occur in the initial search query.
11. The system of claim 9 , wherein 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 comprises: obtaining a first plurality of previously submitted search queries, each of the first plurality of previously submitted search queries being associated with the first resource identified by the first search result; and selecting a first query from the first plurality of previously submitted search queries as the first suggested query, the first query having at least one term that does not occur in the initial search query. 12. The system of claim 11 , wherein determining, using a 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 comprises: obtaining a second plurality of previously submitted search queries, each of the second plurality of previously submitted search queries being associated with the second resource identified by the second search result; and selecting a second query from the second plurality of previously submitted search queries as the second suggested query, the second query having a least one term that does not occur in the initial search query and that does not occur in the first suggested query.