VND/HKD: what to know
The VND/HKD rate shows how much HKD you get for 1 VND. Right now, 1 VND buys 0.000305847 HKD at the mid-market rate. In the other direction, 1 HKD is worth 3,269.61 VND.
In the short term VND is driven mainly by exports and central-bank policy, while HKD responds to its peg to the US dollar.
The Vietnamese Dong (VND) is issued by State Bank of Vietnam. The đồng has very high denominations — notes go up to 500,000. The Hong Kong Dollar (HKD) is issued by Hong Kong Monetary Authority. Most banknotes are issued by three commercial banks, not a central bank.
Use this mid-market figure as your benchmark: compare it with the rate your bank or broker quotes, and the difference is the margin you would pay.