I'm not sure about this, but what about searching for "EAV -"? Would that not require the results to have the space after "EAV", thus making it unlikely to see other stuff because words don't end in eav? (can't think of any right now anyway). Or perhaps any letter after the space, but then the results you want will show up as being 50% instead of 100% (big deal). I imagine that different clients handle this in different ways.