Bhutan passport holders are required to get a visa for them to enter Vietnam.

Bhutan being one of the countries that has no embassy of Vietnam at the moment & the nearest neighboring countries that has an embassy of Vietnam is  Bangladesh, Myanmar, India, Laos, China & Thailand.

Way to get visa for Vietnam without going to embassy : Apply online through an agent in Vietnam to ask for picking up your visa on arrival at airports of Vietnam.

Read more : goo.gl/4xaW2b