Since I don't understand where the word comes from, I really can't even suggest a method to find the threads.
Do you have a test site? vBulletin does have a function to remove 'orphan' posts which are posts that no longer belong to any thread. So, I'm wondering if you could delete the threads via phpMyAdmin, run update thread information counters and then remove orphan posts. I think that may work, but I've never tried anything like that which is why you should try it on a test site first and see if it works.
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