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First, this should have been posted in the Site Bug Reports & Troubleshooting forum.

Second, you're most likely just doing something wrong, but no one could possibly help you if you don't give any actual examples...

Pay closer attention to your search. You're probably using an invalid tag or a combination of tags that don't appear together on any posts.

If you still can't figure it out, ask again in the correct forum thread and provide actual examples. *Thread locked*