Thank you ~
It’s a great help to me.
I try to create a topic with chinese word in your demo forum.
It also can’t find out topic and article with chinese word.
But it won’t show 404 error.
http://demo.simple-press.com/forum/?search=1&new=1&forum=demo-forum-1&value=%E4%B8%AD%E6%96%87%E6%90%9C%E5%B0%8B&type=1&include=1
I guess my web hoster set security configuration to cause 404 error.
I will try to figure out.
Thanks.