The key depends on whether the Ministry of Education of the Socialist Republic of Viet Nam and the Ministry of Education of People's Republic of China (PRC) have signed an agreement on mutual recognition of higher education. If not, it won't work. For example, Taiwan Province Province does not recognize mainland higher education now, and whether you are Peking University or Tsinghua, you are a piece of waste paper in Taiwan Province Province. Of course, higher education in Taiwan Province Province is the same in Chinese mainland and will not be recognized.