When I search for any topic in the search section, it always shows No Results Found. 
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Where is this search section please? I didn't know about it ( UPD: I see it now in the desktop version), but to get all the problems that have some tag tagged to it, I just press at that tag in the PROBLEMSET section (after I check "Show tags for unsolved problems" checkbox).
It is used for searching blog posts related to a particular topic, not just problems.