It's not just vBulletin it's an SQL thing, the SQL search database is generally set to 4 characters and only indexes words of 4 characters or more in length, IG-88 is two 2 character word as far as SQL is concerned and isn't even indexed in the search database... You can lower SQL indexing to 2 or 3 but it will adversely effect other searches and sever loads as it will exponentially increase the database size, not to mention you need full access to SQL to do it, and then you need to rebuild and repair the databases etc... In short it's detrimental to the sever in almost every respect and is a lot of work... As much as a frustration as it is, sadly there isn't much that can be done on the forum end with out causing detrimental side effects to the forum...