How i can set search minimum word length for RM ?
I set search minimum word length for all forum = 2,
It work for post and thread, but this not work for RM.
For RM search minimum word length always = 4.
If you're suggesting that the RM has a different minimum length limit in the search index than other areas of the forum, then what you're describing is physically impossible. The value in the control panel that you identified is simply supposed to be a reference to the minimum word length limit set in MySQL -- setting it incorrectly from that will give you inconsistent behavior. (If you have changed the MySQL setting, you need to rebuild the search index.)
I do not know.
I thought it depends on the server settings .
Messages are searched in MyISAM tables, and resources are searched in InnoDB tables. I think that the InnoDB settings on my server do not allow using a word less than 4 characters long when searching.