By using a collaborative filtering method, we can identify keywords that are closely related to "buy books". Of all the web sites that target "buy books", these are the most commonly targeted keywords by this same group of web sites, sorted by the highest number of web site matches.
The root keyword phrase "buy books" also exists in these keywords. Drill down to see who is targeting long-tail variations off of "buy books".
The keyword phrase "buy books" can be broken down into these keyword pieces. Find out who is targeted short-tail variations off of "buy books".