The study on the Yue tribe has become the main theme of the scientific circles during the past half-century. The discovery of many other civilizations, which were quite different from the Chinese civilization, in the south of the Yellow River has helped researchers learn about "Yue" in the south. Originally, the Yue tribe, as broadly called by the Chinese people, did not mean the name of ethnic groups with the same blood line, but a loose term denoting various peoples who lived from the lower Yangtze basin southward. The conceptual name "Bach Viet" (Pai Yue / Hundred Yue) was used to show all these groups. In the second half of the first millennium BC, under pressure of Chinese empire, the Bach Viet tribes had to move to the south. By studying scattered artifacts of the Bach Viet emigrants, the author see that the emigration of the "Bach Viet" has taken place many times in thousands of years, and spread in various routes, with three main axes: the Mekong River, Truong Son Range and the East Sea. Based on the relics of the Bach Viet peoples, combined with historal records, and can see that the legend of Lac Long Quan and Au Co was partly based on historical fact.