Can I ask if your gift is big or not? in an envelop or in a box? If it's small and in an envelop, I think it's alright but a present box, I don't know if it's safe to send it by normal postI suggest that you send all of them together in ONE package, inside you can put a note writing that These gifts are for vietnamese friends (with their names)and send this package under the name of the Department of French, it's safer than under a person's nameHere's the address, you can copy-paste:
Khoa tiếng Pháp
Trường Đại học Hà Nội
Km 9 Nguyễn Trãi, Thanh Xuân,
Hà Nội
VIỆT NAM