The borders of VietNam are closed due to the COVID19 pandemic. Non-citizen returns are limited to diplomats and Foreigners of economic importance to VietNam, designated so by the government.
The situation is 'fluid'.
Contact the Vietnamese Embassy in India Phone: (+91 11) 26 879 868 (vnembassy-newdelhi.mofa.gov.vn).
ALWAYS REMEMBER the possession of a Visa is NOT A GUARANTEE of entry, Immigration officials at the point of entry have the power to vary or even cancel a Visa. (Common to all countries).
Quarantine is determined by the country you are travelling from. They have old Army camps for 2-week quarantine periods. NOT NICE.
(I am a Westerner living in VietNam)