Please see that page for discussion and consensus beyond the initial comment of: “SOP; Christmas card can also be called thiệp Nô-en, thiệp Giáng sinh, thiệp mừng Nô-en, thiệp mừng Giáng sinh, all are also SOPs.”. The discussion is closed now, and this page is awaiting speedy-deletion by an administrator. If you object, please remove |fail=1 from the template and reopen the discussion.