You can use AdSense for search to create a vertical search, where you can allow your users to search across multiple sites - this could be a network of sites that you own or other related sites that you think your users might find useful. If you write book reviews on your blog, for example, you can use vertical search to specify a list of online bookstores for users to search through. Other examples of vertical searches include computer forums, travel blogs, or political sites you endorse.
To set this up, simply follow these instructions:
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