10. The method of claim 9 , wherein the query store includes a performance score for each query, the performance scores being indicative of query performance derived from user interactions for search results for each query.
9. The method of claim 1 , further comprising selecting candidate augmentation queries from queries stored in an augmentation query store, the selecting comprising: generating term transformations of terms included in the received query; and identifying queries in the augmentation query that include the term transformations of terms included in the received query.