If you want to sell Bitcoin (BTC) for Vietnam Dong (VND), the concept here is understood as swapping BTC for VND.
You send: BTC.
You receive: VND.
Step 1: Choose pair BTC -> VND
If your Bitcoin is already stored on BitcoinVN exchange's account, choose "BTC Balance". Otherwise choose "BTC" to send coin from your outside wallet.
On the receiving end, choose "VND Bank transfer" if you would like to receive VND in your Vietnamese bank account. Please choose "VND" if you want to stored in exchange's account for easing trading later.
Read more about "BTC" and "BTC Balance" here.
Step 2: Enter the amount you are willing to sell
As soon as you finish typing on the left box in BTC, BitcoinVN will show the amount of VND you can receive on the right box.
Step 3: Click SWAP button.
Depends on sending and receiving methods, BitcoinVN will show you the next step. Swaps will be done instantly if "Balance" accounts are chosen, eg. BTC Balance -> VND Balance.
In this example, because we choose "BTC" method (send BTC from outside wallet), BitcoinVN will show you the required wallet information to continue payment.
(Optional) Step 4: Finish wallet transfer
A sample wallet transfer information is shown like below. Please remember to send exactly the amount number shown on the form. Send your BTC to this address and the respective amount of VND will be credited to your VND receiving end, in this case is VND Balance.