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I believe that this is a restriction of MySQL (the complicated stuff in the background that runs forums like XenForo), so unless the forum owner runs their own server/has a lot of control over their implementation of MySQL there's no way round this.  My users have also complained about the minimum-character search limit, and the only solution I have found is to implement a Google site search.

 

Obviously, if I'm wrong, I'm all ears, as I'd love to be able to do 3-letter searches!