On top of my head - Depending on the location, weather can be very hot and humid - Traffic congestion, noise and air pollution in big cities - Low food safet

On top of my head - Depending on the location, weather can be very hot and humid - Traffic congestion, noise and air pollution in big cities - Low food safety, drug safety due to lax regulations - High corruption Apart from the weather, none of these are unique to Vietnam btw, just general traits of a populous fast developing country.