I only read that you can cet a visa before enter in Vietnam, but I ma already there.
Dear Ms Lisa,
Thank you for your question.
If you are stay in Vietnam currently, you can extend your Visa for 15 days more with us and you do not have to leave out of Vietnam.
Also, our office is located in Ho Chi Minh only, you can go to our office in person and bring your original passport to extend. Furthermore, the extension procedure normally takes 7 working days or 2 working days (emergency service).