You can search for chinese characters also with the build in xenforo search. XenForo uses the advanced UTF system so it can handle any characters.
Yes, you can use the enhanced search also on shared hosting. Then you have access to more advanced features like display results based on relevance like google does it. You would need your host to install elasticsearch and configure it for you. Please check with your host regarding that.
Thanks Marcus, I contacted my host and they said shared hosting can't make the changes for minimum characters.
May I know if by installing the Enhanced search, the number of characters I am able to search will be automatically reduced, or will it still be subject to the server's ini configuration (might sound stupid, but please bear with me, I'm new to this).