Specifically because they said they only found stuff on emissions. Never tried it without. It's one of the most common patterns I come across. I search word X

Specifically because they said they only found stuff on emissions. Never tried it without. It's one of the most common patterns I come across. I search word X but find a bunch of word Y stuff that's not what I'm looking for, because word X and Y appear together a lot in Y's context. So I add -Y to the query.