When applying for a working visa, do I just have to show my Diploma once I arrive in Vietnam? I don't need to show it anytime before?

Dear Kelsey,

Could you please confirm us your nationality as well? 

Regards with many thanks,

Hari Nguyen (Ms.)

Dear Kelsey,

You can apply business visa to enter Vietnam without any document.

Regards,

Hari Nguyen (Ms.)