Message Searching Relevance Options (vBulletin Internal Search) 
vBulletin Options > vBulletin Options > Message Searching Relevance Options (vBulletin Internal Search)
Note:
These settings only apply if you are using the vBulletin Search Engine. They do not apply if you are using Full Text Search.
Copyright © 2021 MH Sub I, LLC dba vBulletin. All rights reserved. vBulletin® is a registered trademark of MH Sub I, LLC dba vBulletin.