Vietcombank sold the dollar at VND25,470, up 0.02% from Wednesday.
The State Bank of Vietnam kept its reference rate stable at VND24,245.
The dollar went up 0.04% to VND25,740 on the black market.
The dollar has increased against the dong by 4.30% since the beginning of the year.
Globally the dollar hovered near a one-week high on Thursday following its best day this month against its major peers after minutes of the last Federal Reserve meeting revealed a willingness to raise interest rates among some officials, Reuters reported.
Sterling held its ground at $1.2723, following a surge to as high as $1.27610 on Wednesday for the first time since March 21 as sticky inflation crushed bets for a June cut by the Bank of England.