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 suit. <nowiki> </nowiki>Blue stands for the factor of the sea, and the hope - the hope in being successful in learning Vovinam. With the following 3 exams yellow stripes are added to the blue belt. The 3rd yellow stripe is followed by the yellow belt. <nowiki> </nowiki>Yellow It symbolically stands for the skin color of Asian people. It symbolizes the "skin deep" internalization of the martial art and the philosophy. In other martial arts this belt is black. Therefore, a Vovinam student who carries a yellow belt is allowed to carry a black belt. This makes a comparison to other