Khai Nguyên sings with overtones, January 1st 2016, HCM city, VIETNAM 05.04.2018 by Hai Tran Quang Khai Nguyên sings with overtones, January 1st 2016, HCM city, VIETNAM QuangHai Tran Published on Jan 17, 2016 DANG VAN KHAI NGUYEN sings with overtones, January 1st 2016 in HO CHI MINH city, VIETNAM