Ho Chi Minh City: Yun Hyon-hi scored twice as DPR Korea maintained their perfect record at the AFC U-19 Women's Championship with a 5-0 win over Vietnam at Thong Nhat Stadium.
Jon Myong-hwa gave DPR Korea the lead in the 16th minute and they never looked back as four goals in the second period, highlighted by Yun Hyon-hi's two headers, sealed their third consecutive triumph.
Victory over Japan on Thursday will now see the North Koreans win the trophy with a game to spare.
DPR Korea were presented with a sight of goal in the 14th minute when a poor clearance fell to Kim Su-gyong but she sliced wide.
Two minutes later, they went in front when Pong Son-hwa weaved her way through the Vietnam defence down the right to reach the byline before cutting the ball back for Jon Myong-hwa to side-foot into the empty net.
Kim Su-gyong then spooned a cross over the bar before a defensive error let in Kim Jo-ran but she fired high and wide.
Yun Hyon-hi headed a corner wide at the back post and Kwon Song-hwa had the ball in the net just before the break but it was ruled out for offside.
Kim Un-hwa glanced Kim Su-gyong's driven cross wide at the near post and Vietnam keeper Tran Thi Kim Thanh punched Yun Song-mi's free-kick around the post as DPR Korea ended the half well on top.
The Koreans continued to dominate in the second period and after Kim Su-gyong had shot wide, she found the back of the net just after the hour mark only to see her effort also chalked off as the midfielder was adjudged offside.
However, DPR Korea doubled their lead in the 64th minute when Yun Hyon-hi headed in a cross from the right inside the six-yard box.
Four minutes later, they added a third goal after Kim Un-hwa ran clear of the home defence and slotted into the corner and DPR Korea netted their fourth in the 70th minute when Thi Kim Thanh failed to cut out Kim Un-hyang's low cross and Kwon had the simple task of tapping in to an empty net from three yards.
With a comfortable lead, DPR Korea were mostly content just to retain possession although they occasionally forayed forward and Yun Hyon-hi saw a header from Kim Un-hyang's cross following a corner well saved at point-blank range by Thi Kim Thanh with four minutes to go.
The Vietnam keeper then easily held Kim Un-hwa's curling effort from outside the box before Yun Hyon-hi claimed her second goal and the Koreans' fifth with a simple header from Kwon's cross on the stroke of full time.