help with translation

[m0rph3us]

Hi can anyone help me with this?

neu ban khong gap toi truoc khi toi ve viet nam, hen gap lai lan sau

[Lenguyen]

Có thể dịch như sau:
if you don't see me before I leave for Vietnam,See you next time then .

He/She probably meant to say goodbye now just in case they won't see each other before leaving for Vietnam.