Vietnamese entry visa is required for all foreigners wishing to visit Vietnam, except those enjoying visa exemption in bilateral agreements between Vietnam and country concerned and those enjoying unilateral visa exemption policy by the Vietnamese Government. Entry visas to Vietnam can be applied BY POST or IN PERSON (by the applicant or anyone on his/her behalf) at the Embassy. The visa application procedure at the embassies would require applicants to send off their passport and fill applicant form (in person or by mail). The normal waiting time for processing visa application is around 1 week (shorter time could be arranged for additional fee). You could also apply for visa on arrival as the process only take two working days at most and you could apply from anywhere as long as you have access to the internet.
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