5. The method of claim 1 , comprising: identifying one or more additional substitute terms that were not used to obtain the first search results; and generating the second search query including adding the one or more additional substitute terms to the first search query.
5. The method of claim 1 , comprising: identifying one or more additional substitute terms that were not used to obtain the first search results; and generating the second search query including adding the one or more additional substitute terms to the first search query. 6. The method of claim 5 , wherein identifying the one or more additional substitute terms comprises: identifying one or more additional substitute terms that have lower confidence scores than any of one or more original substitute terms used to obtain the first search results.