Whichever tag I select, it says there are no problems
The results shown are those problems which have all the tags that you have selected. Here, you have selected 4 tags, and there’s no problem which has all those 4 tags. Try selecting fewer tags, and you’ll them properly.
Right, I understand. What about this example? It says there are 20 problems about Djikstra but I still get no result?
Ah, this seems to be an issue with tags having an apostrophe in their name. Thanks for reporting. We’ll look into it.
This should be fixed now.