US Patent 7584179 Method of document searching

A method of searching is performed by providing a term for use in searching of information. The term is useful in determining documents relating to the term. In response to the provided term, search results within a search result set are determined. The search results include an indication of some of the documents relating to the term. The search result set defines a resulting search space. A further term is provided for reducing the search result set or expanding thereof. The further term is provided based on the term, terms relating to documents within the search space, and the resulting search space.