This is not possible with the current version, however there is going to be an update available very soon (this week). I'm implementing a few new funtions, one of them is “Look for content from the same tags only?” option, which I believe is what you are looking for.
You will get an email from codecanyon once this update is downloadable. (probably in 2-3 days)Best,
If you like my products, don't forget to rate them on codecanyon :)