Vietcombank sold the dollar at VND25,454, down 0.02% from Wednesday.
The State Bank of Vietnam’s reference rate was stable at VND24,246.
The dollar went up 0.51% to VND25,770 on the black market.
The greenback has increased by 4.23% since the beginning of the year.
Globally the yen surged against the dollar in early Asian hours on Thursday on what traders suspected was another round of intervention by Japanese authorities to stop a sharp slide in the currency, with the 160 level seen as a key line of defence, Reuters reported.
The dollar fell sharply to precisely 153 yen from about 157.55 yen for reasons that were not immediately clear, but traders and analysts were quick to say it was dollar selling ordered by Japan's Ministry of Finance to support a currency languishing at 34-year lows.