By using a collaborative filtering method, we can identify keywords that are closely related to "drug test". Of all the web sites that target "drug test", 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 "drug test" also exists in these keywords. Drill down to see who is targeting long-tail variations off of "drug test".
The keyword phrase "drug test" can be broken down into these keyword pieces. Find out who is targeted short-tail variations off of "drug test".