Check out this blog post for a work item search tool
I've installed it and it works pretty good. You can type a single word, and it (pretty quickly) finds the matches.
For example, if you enter "printing" and it will find all work items that contain "printing" in the text fields.
However, if you enter "printing errors" it will do a phrase search (matching only 'printing errors' and not for separate words 'printing' and 'errors'). It was a little unexpected for me, but still a very cool tool.
Oh, if you type the work item ID, it finds the work item very fast.
Install it and try it out. Work item search is high on our list for a future release. Let me know where this add-in helps and where it falls down. Let me know!