If I type in
in the search on Stack Overflow, it gives me 0 results. But if I search by:
I see a number of questions that have this tag on them. Seems like something is broken with the tag search feature.
Are you on the featured or faq tabs? When searching for a tag or combination of tags only, you're redirected to the tag page, the tab you're on is remember from the last tab page you browsed.
If you're on the featured (bounty) tab though, there may be no questions currently with a bounty that matched the tags you're searching for. However, aside from featured/*faq*, all of the other tabs (newest, votes, active) should have questions, unanswered will have some if any match that criteria as well.
I currently see 9 questions tagged textboxlist (none with a bounty) on stackoverflow: http://stackoverflow.com/questions/tagged/textboxlist
Update: In the build tonight, to make things clearer, new messages will appear on the FAQ and Unanswered tags when no questions show up (since there may be questions, but none matching the criteria for those tabs):