[email shielded] Thank you very much! I'm away today, so I will get back for you by e mail as quickly as possible Chu?n b? du h?c: B?n d?ch ???c ch?ng nh?n có th? lo?i b? rào c?n ngôn ng? nh? th? nào Nh?ng bài ki?m tra ???c trò ch?i hoá