Dont forget the currency aspect to this trade.
If you want exposure to emerging markets take a broader view like the emerging markets ETF, you dont know enough about the economics for this to be anything other then a punt.
Inflation increased to 25.2% in May, the currency is dangerously unstable, central bank hiking rates has not been able to slow inflation growth, and Vietnam will probably need an IMF intervention/currency devaluation in the coming months.
Read an article recently where the writer made a strong arguement that the decline in Vietnamese share prices is a bellweather for Asian markets in general.