Vietcombank sold the dollar at VND25,477, up 0.03% from Wednesday.
The State Bank of Vietnam kept its reference stable at VND24,245.
The dollar went up 0.27% to VND26,030 on the black market.
It has increased by 4.33% since the beginning of the year.
Globally the yen languished near a 38-year low on Thursday and struggled on the weaker side of 160 per dollar, keeping markets on alert for any signs of intervention from Japanese authorities to prop up the currency, Reuters reported.
In the broader market, the dollar was on the front foot and stood near an eight-week high against a basket of currencies, helped in part by a weaker yen and as it rose in step with U.S. Treasury yields.