Hrm. Well, the easiest way to do it is just to create a small form that sends a query to google.com/search?q={the query}%20site:{your domain}
If you're using a content management system, you can just create
fulltext indexes of your content and then create a script that runs a
fulltext search on your database and outputs the results.
For everything else, there's MasterCard.
As in there are several commercial packages that will do this for you. Probably not cheap.
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