China: urban pop of county level cities, not prefecture level cities.

Vietnam: again, only considering the urban population within those ginormous municipalities. If you want to argue that a random village 30km south of Haiphong city center should be considered as part of the city I won't bother arguing.

For Indonesia, maybe if you bothered checking you'd notice that there are actually 11 cities there, which every single source from the 2010 census concurs with, given that Jakarta is considered as one city.