Search filters should be easier to use

I noticed that if you use the normal filters such as language, age/gender, and purpose, the filters are applied so that the results are only shown if they match all of the filters. This works fine. In fact, before you click on a new filter, there is a number indicating how many results adding that filter will narrow it down to.

However

When you type a tag into search, it seems to expand the results instead of refine them. For example, you could search for "cowboy" and get say, 60 results. Then you click on "English-North America", which has a little "23" next to it to indicate that this will narrow it down to the 23 samples that are both NA English and have the cowboy tag. Except instead it now shows you all 20,000+ samples that either are NA English or have the cowboy tag.

This is frustrating. Adding a new filters should produce consistent, predictable results. If you want to include an option to expand results instead of refine them, it should be clearly labeled.