Near every, or virtually every, search box on eBay is the link (usually to the right): "advanced search." You click it and get a very nice page where there is a bigger search set-up (it takes up a page -- lots of options) where there is box entitled "Exclude these words ....Exclude words from your search." You put the words you want excluded in that box. Try it a number of times in different ways, different words, commas, no commas. Fun. I'll put a screen shot in my next post.
Robt.