Can attest to this. My middle name did not make it onto my e-visa last year, and I did not notice this omission (not understanding that it was a necessity) until I got to check-in and was denied. Had to scramble and pay a lot of money to an online express visa service in order to make my flight.BTW make sure you have your middle name on your flight tickets and Visa for Vietnam , they are really picky for that.