Vovinam to demonstrate Vovinam publicly in Hanoi with his disciples in 1940, Nguyễn was invited to teach the art at Hanoi's Ecole Normale, and Vovinam gained in popularity. During the following years, political unrest increased throughout Vietnam; due to the system's nationalist political orientation, the art came under suppression. By 1954, Nguyễn had emigrated to South Vietnam, where he was able to continue to teach and establish Vovinam schools. After his death in 1960, Grandmaster Le Sang continued the development and international promotion of Vovinam until his own death on September 27, 2010. The first Vovinam school outside of Vietnam was
Vovinam even further. The 5th to 10th degree blackbelt are shown as a completed red belt with 1 to 6 white stripes. <nowiki> </nowiki>White stands for the infiniteness, the bones; is the symbol of the depth of the spirit. The white belt assigns the master the absolute mastery of Vovinam Việt Võ Đạo. On the white belt thin, lengthwise stripes in blue, black, yellow and red symbolize the whole of Vovinam (Việt Võ Đạo) again. This belt is reserved for the "Chưởng Môn". Now, Vovinam has two different sets of belt ranking because of the different training program: The WVVF Vovinam