Does this search facility exist?

Hi, Im looking for a search facility that uses tags but allows users to continue adding tags so it filters the results as much as possible. Ive seen it around but can’t think where right now but hoping there is a WP plugin that offers this functionality. This is how Id like it to work:

– Content is added to website and tagged
– I go to a page where this content is and want to find similar content but using the tags I want
– I click on 1 tag or more but I can keep adding tags even after I have produced some results
– This keeps filtering the results until I find (or don’t find) what I want

Any suggestions? Thanks.