Vietnam is not a cold country. But the seasons have fluctuation in moisture levels that make winter feel colder. Also houses are not equipped with heating.You will find the table below useful which will give you an idea of average temperatures by season.
The Vietnamese currency is Vietnamese Dong (VND). The Dong is in the form of notes:
200-500-1,000-2,000-5,000-10,000-20,000-50,000-100,000-200,000-500,000.