Vietnam needed a draw to stay on top of the group and the host achieved that goal. Thailand missed a chance to lead after Dang Van Lam saved a penalty kick by Theerathon Bunmathan in the first half.
The War Elephants dominated the game in Hanoi but could not break the Vietnamese defence.
Vietnam still topped Group G with 11 points in five matches and Malaysia moved up to second after a 2-0 victory over Indonesia at Bukit Jalil.
The eight group winners and four best runners-up advance to the continent’s 12-team final qualifying stage.
Thailand earned only one point in two matches. They will host Indonesia on March 26 and play an away game in the United Arab Emirates before ending the qualifying round by hosting Malaysia.
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