Could the keyword be part of a longer word? You can see now that keywords imbedded in a run-together phrase are being bolded. Something like (ok I see the Looksmart banner ) - in the word looksmart you have the words look, looks, smart and mart.
My domain is just part of my name -- how unimaginative is that? The domain comes up number 1 through 4 on SERPs for various keywords I'm focused on. Interestingly, searching for my family name results in my domain appearing somewhere on page two of SERPs.