Ms. Do Thi Hoai Thu, Ph.D Tel: (84-28) 3 8245618 (Ext: 126), Fax: (84-8)38232175 Email: internationalconference2019@vnseameo.org or dththu@vnseameo.org Ms. Nguyen Thi Hong Gam Tel: (84-28) 3 8245618 (Ext: 126), Fax: (84-8)38232175 Email: internationalconference2019@vnseameo.org or nthgam@vnseameo.org