Vietnam is currently only issuing one month Visa’s. Alot of travelers are doing Visa runs in Lao Bao. This is on the HCM road near the Laos border and serves as a good point for extending a one month holiday into more. The one pack wonderes made a video on how to do it.
Visa’s can also be extended with Cambodia (near HCM), or Laos (near Hanoi). Hanoi would be the Na Meo Border.