So you are curious on how to make your site rank for a specific keyword? You should not worry about one keyword. You should have a spectrum of search terms that work well, especially for ask and teoma. The usual suspects will help.
Link text Titles Inbound and outbound links keyword density I believe teoma's engine likes on topic sites that link to you with keyword link text.
My index page was listed on first page after PFI for a competitive keyword phrase. I made some minor changes to the page to simplify use for visitors. Now the page is buried. I've tried to go back to the original but no sucess. Moral: If its not broke don't fix it.