3 word search?

[v123shine]

Hello...

How to make 3 word search in vb 3.8.x ??

I following this step, but still can't work.

STEP 1
Search Type -> Change "Remove Fulltext Indexes" to "YES"

STEP 2
Vbulletin Options -> Message Searching Options -> Search Index Minimum Word Length put 3 into the text field

STEP 3
Edit MySQL's my.cnf and add below code:

[mysqld]
ft_min_word_len=3

[myisamchk]
ft_min_word_len=3

STEP 4
Maintenance -> Update Counter -> Rebuild Search Index

And the result, i still cant search 3 letter words in Vbulletin

Can someone help me, please!

Thank you