I thought I had answered this over on vb.com (if you are the same user).
Quote:
If you look in functions_search.php around line 342 is the function fetch_similar_threads. Right under there are two queries, one at line 352 and the other on line 452.
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In each of these two queries, there is a LIMIT 5. Try changing that to LIMIT 10.
I have NOT tried this. You may want to try this on your test site first. And, I believe this will only affect threads made after you make this change. All older threads will still only have a max of 5 similar threads listed.