One of the most important tasks of search engines is presenting more additional relevant web pages and reducing those pages which are useless for users. Query expansion is an efficient method for dealing with this task. In this paper, variable precision concept (VPC) based on formal concept analysis(FCA) is firstly proposed and its properties are discussed. Then a new strategy of expanding query terms based on VPC is proposed. According to this new strategy, users can set the query precision in terms of their interests and obtain the additional relevance web pages. Finally, application results show the efficiency and effectiveness of this method.
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