In one implementation a method for disambiguation of search phrases is provided, which may include identifying interpretation clusters using bidded search terms of content providers and influencing a position of a search result in a search results list based on the interpretation clusters. In one implementation a method is provided for interpretation clustering, which may include identifying terms and associated content providers and calculating a matrix from the identified terms and associated content providers. Similarity scores between content providers based on the matrix are calculated and interpretation clusters are assigned using the similarity scores. Bidded search terms and/or searcher clickthrough terms may be used. In one implementation, a method is provided for increasing the relevance of search results, which may include receiving a search query and identifying the search query as ambiguous.