If I use my e-Visa to enter/exit Vietnam, what do I have to do at the checkpoint?
E-Visa holders must present the printed e-Visa and valid passport at the checkpoint.
Do I need to enter Vietnam on the exact date specified in my e-Visa application?
The validity period of your e-Visa begins from the date specified in your approved e-Visa document. You can enter Vietnam on any date within this validity period.
Can I enter Vietnam before or after the validity period specified in my e-Visa?
No. You cannot enter Vietnam before or after the validity period specified in your e-Visa.
What if I want to enter Vietnam before my e-Visa validity period?
You must complete a new e-Visa application. The previous e-Visa application will be canceled once the new e-Visa is issued.
If I enter Vietnam a few days after my granted arrival date, can I stay in Vietnam for full 30 days?
No. You can enter Vietnam after your granted date and must leave the country by its expiry date.
Is it necessary to complete all required information in the application?
Yes. You must complete all required information to be eligible to receive an e-Visa.
What if my name is too long or includes special characters?
Write your full name as it appears on the ICAO line of your passport data page.
What photos are required for the application?
Two photos of the applicant must be uploaded:
-Portrait photo (4x6cm): Looking straight and without glasses.
-Passport data page: Full page including photo, personal information and ICAO lines.
If my e-Visa is refused or unused, will my payment be refunded?
No. Payments for e-Visa applications are non-refundable.
How long does it take to obtain an e-Visa?
An e-Visa is normally processed within 3-4 working days after the Vietnam Immigration Department receives the completed application and full e-Visa fee.
Read more detail at this link.