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After suffering a 4-2 defeat by Thailand in Sunday's opener after letting slip a two goal first half lead, Dilshat Kadyrov and Gulbek Abdurazakov scored in the last five minutes of the first half to again put Kyrgyzstan in control.
Nurjan Djetybaev added a third four minutes after half-time before Tran Hoang Vinh pulled a goal back for Vietnam three minutes later.
Hoang Vinh further reduced the deficit to set up a tense final six minutes, but Kadyrov added his second in the last minute to halt Vietnam's hopes of adding to Sunday's 7-3 win over Korea Republic.