If the Indian 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
EMBASSY OF VIETNAM IN NEW DELHI, INDIA
Address: 20 Kautilya Marg, Chanakyapury, New Delhi – 110 021
Phone: (91-11) 2687.9852
Fax: (91-11) 2687.9869
Email: firstname.lastname@example.org | email@example.com
CONSULATE GENERAL OF VIETNAM IN MUMBAI, INDIA
Address: B-306 Oberoi Chamber New Link Road Andheri (w), Mumbai 400 053, India
Phone: (91-22) 26736688 | 6732339
Fax: (91-22) 26736633