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 martial arts easier, e.g. in public performances. A person who wears a yellow belt with one or more stripes is considered an instructor. Following in a longer period of time, respectively 3 red stripes are added to the yellow belt. This corresponds to the 1st, 2nd, respectively 3rd degree blackbelt (Đẳng). The exam following the 3rd red stripe is the master's exam. Passing the exam successfully assigns the right to wear a red belt with a circulating yellow border (4th degree blackbelt). <nowiki> </nowiki>Red stands for the blood and the intensive flame. The student has internalized Vovinam (Việt Võ Đạo)