This task is not Elementary (elementary means @Veky can solve it as one-liner). It is also not Simple or Moderate. This task is Challenging. So far I have spent whole day on it and I still do not have an efficient solutuion.
Broken Window
SEARCHING TIPS
==============
author:[username] - Returns posts by user
associated with the given user.
tag:[tag_name1],[tag_name2], ... - Returns
posts associated with the given tag(s).
phrase - Returns posts that contain the word
or set of words in title or text.
