How can I change all sensitive words in our forum

[www.ketcau.com]

Dear Vbulletin !
I come from www.ketcau.com/forum/ of Viet Nam.
In our forum, some members have post some sensitive words. How can I change all the words in all forum by another words ?
(or how can I using "filter" words function ?).
Thanhs alot !

[Marco van Herwaarden]

To get vB support on these forums you first need to be a licensed customer and register for Priority Forum Support. To do this, please go here:
http://members.vbulletin.com/membersupport_priority.php
...and enter your email address in one of the boxes. You'll need to have your customer number and password to access the page.

Once you've done this, please post in the appropriate support forum for your version.