Both decisions followed video reviews. With the visitors reduced to nine men, Ivan Saponjic, Yvo Rebori and Bryan Ly scored for Da Nang.
The defeat followed Nam Dinh's emphatic opening-round victory. Elsewhere, Ninh Binh beat Thanh Hoa 2-1 to reach six points, while Bac Ninh defeated Cong An TP HCM 1-0.