between and all the fuas of different sizes in viet nam grew much faster at an average annual rate of than the fuas in oecd countries on average while in oecd countries larger fuas grew faster than smaller fuas viet nam showed a different pattern both the three largest fuas ho chi minh city ha noi and hai phong with a population of million or more and smaller fuas with a population of less than grew faster and respectively compared to mediumsized fuas in the case of viet nam it appears the country has seized the opportunity as its urbanisation process has come together with strong increases in income levels