Many Windows Phone 7 users complained on this issue in Zune marketplace. When you search for an application in Zune marketplace either Zune Desktop or through your phone, the search results are displayed just on the basis of application name leaving the application keyword or description. Now, Microsoft has updated the search experience by combining the application keyword, description with application name. If you are not still satisfied with this, then there is an app called Appfinder in the marketplace which you can download from here allows you to do find applications in the marketplace.
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