Indian citizens can get Vietnam visa by applying for Tourist Visa or Business Visa :-
For Vietnam Tourist Visa Application, you can apply online by filling up application form and proceed with payment steps. The form is relatively simple to fill. If you are not sure when to travel, just provide the expected travel date. Please review the visa validity and put expected date of travel. Similarly, you can select any port of entry in dropdown list since the approval can be used at every Vietnamese international airport.
The most popular mistake that Indian applicants often make is putting in date of birth. Please note that the date format is like month / date / year.
For Vietnam business visa application, you need to complete application form. Along with that you have to do emailing the passport copy with intended travel date. You just need to make online payments with credit/debit card and the processing gets started.