In Vietnamese, 'nam' means south and 'bac' means north. In Mandarin Chinese 'nan' means south and 'bei' means north. Thus, Bei Jing, northern capital. Dong Jing (Tokyo), eastern capital. Xi An, where they found the terracotta warriors, western safety or sanctuary. I could be a bit off in the translations, yet pretty close I am sure. In Mandarin, the word for Vietnam sounds like 'yeah nan'.
It was a failure in the end. He lived in exile until his death in China. Per Wiki - The Qing Empire recognized Nguyễn Huệ as a new ruler of Vietnam and gave him the traditional title "An Nam Quốc Vương" (King of Pacified South).
SW from Bangladesh across the Bay of Bengal to Ceylon. (Play from modern Sri Lanka.) Like this Ceylon half cent? It could be yours. Enter the giveaway (see the link in my signature line). It is one of many "winner's choice" Pick Bin selections.