BULK LOAD UTF-8 type (Arabic or Persian) data

Hello everyone.
When I try to Bulk Load data in UTF-8 type (Arabic or Persian) using COPY FROM STDIN, it converts Arabic or Persian characters to question marks !

My COPY statement is :
COPY Person_T(ID,fName,lName) FROM STDIN RECORD TERMINATOR E'\n' DELIMITER E'\t' ENFORCELENGTH NO COMMIT;

In INSERT or UPDATE statement it works great but COPY not.

I set Locale to fa_IR using SET LOCALE TO fa_IR; but nothing changed.

Is there any chance ?

thanks.