So you are saying territorial size defines a country? Based on the your logic, USA was not a country until 1959 when it annexed Hawaii?
Let me educate you, it is sovereignty that defined a country. By any historian, the notion of one country existed in China since 220 BC, there's always one recognized divine emperor.
Min Yue and Nan Yue were established by Han Chinese who migrated south, they were vessel to the empire and the emperor. I know where you got that from. Look, picking up post by Vietnamese troll only demonstrates your desperate intention to troll.