Vietnam scored a late consolation through Tran Manh Dung but it was the Gunners who continued their pre-season form with their second tour win.
Read how the action unfolded with our live text commentary below.
He said: "Everybody came through well and it was interesting to see some young players, who have practised with us.
"They all did well. Gnabry is a bit older but Olsson, Gedion, Eisfeld, they did very well when they came on. Chuba Akpom did well, he looked sharp up front."
"I'm delighted with the win and the run out, and I scored as well so I'm very happy," he told the club's official website. "It's always good to score and great for your confidence as well so I'm very happy."
Fabianski, Martinez, Miquel, Mertesacker, Aneke, Ramsey, Walcott, Akpom, Wilshere, Zelalem, Ryo, Eisfeld, Olsson