Was Guangdong a part of Vietnam in the past?

Was Guangdong a part of Vietnam in the past? How did Vietnam lose Guangdong to China?

The map of Nan Yue

This is the picture of the museum of Nan-Yue. It is in Chinese, not Vietnamese.

This is the picture of the relic of Nan-Yue in Guangzhou.

Thanks for the picture of the question. Guangdong and Vietnam were within the Nan-Yue, and the political and cultural center was in Guangzhou. It means that It was Vietnam belonged to Guangdong, not the other way around.

Zhao Tuo, the king of Nan-Yue, was the governor set by Qin Shihuang. When the Qin Dynasty ended and the Han Dynasty was established, Zhao Tuo did not join Han immediately. It is like Taiwan does not join Mainland immediately. Zhao Tuo joined Han eventually. Nan-Yue belonged to Qin Dynasty first, in between for a period of time, then joined Han Dynasty.

Vietnam has long been part of China until the French annexed it from China.

This status is for local Cantonese people who defend Chinese territory against the French invasion of Guangdong Province.