If the UAE passport holders want to apply visa at Vietnam Embassy, they should to know that:
Visa administrative Institution: Vietnam Embassy
Processing time: depends on you how fast you need. But for sure, you should make a call to Vietnam Embassy for details.
Required Documents: passport, money and 1 new envelope with stamp on it and your exact home address in order to avoid losing issues.
How to apply: please take a look at contact information of Vietnam Embassy below
VIETNAM EMBASSY IN ABU DHABI, UNITED ARAB EMIRATES
Address: Villa No.147, Salama Bint Butti Street، Al Mushrif – Abu Dhabi – United Arab Emirates