>>I think the original results get cached. I'm using IE8. I noticed this problem before too. In other words, if first I try more restrictive search and then after getting this message try to remove few words or extra conditions, I often get 0 results again.
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>If you click the Search button and simply enter Category, do you get some results?

Yes, I do. 3 pages of results. (BTW, didn't find what I wanted to find).