26. The method of claim 25 , comprising: determining, using the query log data, that the particular search result is one of the search results that were identified using the one or more revised search queries; and in response to determining that the particular search result is one of the search results that were identified using the one or more revised search queries, adjusting a click count for the one or more query term optionalization rules that are specific to the particular query term.
27. The method of claim 26 , comprising assigning a score to the one or more query term optionalization rules that are specific to the particular query term based at least on the click count and the skip count.