Entry visas to Viet Nam can be applied BY POST or IN PERSON (by the applicant or anyone on his/her behalf) at the Embassy.
By post (Check list): Original passport, form + photo, fee, return envelop, air ticket copy (if 3 months multiple visas).
In person (check list): Original passport, form+photo, fee, air ticket copy (if 3 months multiple visas).
Please see detailed instructions inside this article.