We are using both information tags (20+) and security tags (100+) on documents.  I am trying to run a search for all documents that have more than one security tag applied.  In the client search, I can highlight multiple tags and say that the document needs to have "at least one" of the tags.  This is great to search for only documents that have the security tags but does not allow me the versatility to search for those that have more than one of those high-lighted tags.  I am open to doing this via script or SQL query of the repository database via Workflow but am hoping for an out-of-the-box solution.  Has anyone found a way to do more advanced searches in the client?