Sites' positions in our search results are determined automatically based on a number of factors, which are explained in more detail at http://www.google.com/technology/index.html. We don't manually assign keywords to sites, nor do we manipulate the ranking of any site in our search results.
In general, webmasters can improve the rank of their sites by increasing the number of high-quality sites that link to their pages. For more information about improving your site's visibility in the Google search results, we recommend reviewing our webmaster guidelines. They outline core concepts for maintaining a Google-friendly website.