USD or Dong currency?

it's better that you brings the USD then exchange in most of the jewelry places or even at the hotels of where are planning to stay...it's not true that they only accept USD..you must've mis-informed by someone..as of now $1 USD = 21,000VND that will give you the idea.most of the hotels will give less values of the exchange rate..good luck and have fun in VN...take care