*Hochiminh city: ACE NewTech Co.,Ltd. 12FL, Viettel Tower, 285 CMT8 St. Hoa Hung Ward, Hochiminh city, Vietnam. Email: info@ace.com.vn;
*Hanoi: ACE Hanoi JSC. no.58 Hang Bac St., Hoan Kiem Ward, Hanoi city, Vietnam. Email: acehanoi@ace.com.vn