ADSelfService does not recognize Thai language login name.

ADSelfService does not recognize Thai language login name.

I install ADSelfService Plus 4.3 on Windows Server 2008. I can change passwords for English login names.
But when I try changing passwords for Thai language (Unicode) login names, ADSelfService Plus 4.3 cannot find the account in Active Directory.
No name appeared in the log file.
Please help.