The State Bank of Vietnam set the daily reference exchange rate at 23,147 VND per USD on January 28, up 3 VND from the previous day. (Photo: VNA) Hanoi (VNA) - The State Bank of Vietnam set the daily reference exchange rate at 23,147 VND per USD on January 28, up 3 VND from the previous day. With the current trading band of +/-3 percent, the ceiling rate applied to commercial banks during the day is 23,841 VND/USD and the The opening hour rates at some commercial banks stayed stable. At 8:25 am, Vietcombank listed the buying rate at 22,940 VND/USD and the selling rate at 23,150 VND/USD, both unchanged from