I once tried to search for a scammer named "internal revenue services" (with an S at the end) and it just wouldn't let me, quotes or not.

I tried it now and it's better, but not perfect. Most pages contain the term (as a misspelling) but a few didn't seem to (one had the word "services" in many places on it, however) and there was still a big Google Maps result and a Wikipedia result at the top for the actual IRS.