You can use Google's site: syntax to restrict your search to a single Web site. Make sure there's no space between site: and your Web site. Follow with a space and then your search terms. You don't need to use the "http://" portion of your URL.
You could also widen the search to include all the About.com Guide sites:
site:google.about.com power search tricks
This same search can be widened to include all the Web sites within a domain.
Google's site: syntax can be mixed with other syntax, such as AND and OR searches.
site:edu text buyback dates