11. The computer-implemented method of claim 10 , further comprising selecting an item of sponsored content from the database using the phrases.
11. The computer-implemented method of claim 10 , further comprising selecting an item of sponsored content from the database using the phrases. 12. The computer-implemented method of claim 11 , further comprising: receiving terms for selecting an item of sponsored content; replacing at least one term that is a unigram marked as ambiguous.