If you have a constant need of searching less than 3 letter words, I'd go UBB.threads Internal; the MySQL Full-Text Search uses the MySQL defaults which generally don't allow for searching 3 letters or less (see fine tuning below).
See UBBWiki: Search


You can find more information in changing this MySQL Server Setting at:
Change the full text index minimum ...ext index minimum word length with MySQL
12.9.6. Fine-Tuning MySQL Full-Text Search


You can also find several discussions on these forums by using the search function and looking for "MySQL Full-Text Search".

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