All kinds of banknotes issued by Vietnam National Bank, including 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000 and 10000, are all over the country. The Bank of Vietnam also issued 500,000 yuan, 65,438 yuan+0,000,000 yuan and 5,000,000 yuan as the currency of Vietnam. The exchange rate between Vietnamese dong and RMB is 1800: 1, but RMB can only be exchanged in the north (Hanoi and Halong Bay). From the middle to the south, you can easily exchange US dollars at the local bank at the exchange rate of 15000 VND 1 US dollar. If you don't want to bring too many dollars,