How do I view unanswered questions with a certain tag?
How do I search for unanswered questions with a specific tag (or tags)?
You can now also use the advanced search box like so:
Which translates to a URL of:
Take note of URL encoding, such as this search or items with the c# tag, but no answers:
Go to the unanswered questions page and choose the c# tag from the list of tags on the right.
You should now see the unanswered questions with the tag you chose. if you do not, read on.
This is really confusing. There are several questions about it with the same answer and at first I thought they were all wrong. However, it does work. Here is the key: You have to make sure that in the upper right hand corner either "Newest" or "Votes" is clicked. If the "My Tags" tab is clicked it will not work correctly.
Try using /unanswered/tagged/c# (which is c%23 because of url-limitations).
Search for '[C#] or [CSS]', then click on Unanswered to find all questions for any topic you think you could answer.
For more info see: Filtering questions by multiple tags