To use tags in queries and filer data you need the Visual Studio 2013 Update 2 RTM installed on premise.
With this release, tagging gets even better. View and edit tags right from Visual Studio, or use them as part of a work item query for both the Contains and Does Not Contains operators (in both Visual Studio and Web Access).
More details can be found here: http://www.visualstudio.com/en-us/news/2014-apr-2-vs