https://www.whatrunswhere.com/features.php
http://www.adgooroo.com/for-advertisers/advertiser-features/
http://www.similarweb.com gives you the “not provided keywords” based on 60 million users gathering information.
Read this blog post – http://blog.similarweb.com/similarweb-pro-reveals-your-true-traffic-data-with-not-provided-keywords/
http://www.spyfu.com/ well known, somewhat similar to keywordSpy
There is always the option to do a simple backlinks search and go through the results for media placements.