> My wife does this. It drives me crazy; I'm thinking "That's not how you search! You should just type 'changing oil'." But she gets the results she's looking for anyway so she doesn't listen.

And why should she? Is she happy with the results? Google has done it's job. The keywords aren't there for you, they're there for Google so they can make searching work even if you lard up your search with unnecessary words.