Vietcombank sold the dollar at VND24,570 Monday, up 0.29% from Sunday.
The State Bank of Vietnam (SBV), however, lowered its reference rate by 0.02% to VND23,954.
The dollar inched up 0.12% to VND24,970 on the black market.
It has increased against the dong by 0.61% since the beginning of the year.
Globally, the dollar rose to an eight-week high against its major peers on Monday as traders clawed back bets for aggressive rate cuts by the Federal Reserve this year in view of a still-resilient U.S. economy, Reuters reported.
The yen as well as the Australian and New Zealand dollars meanwhile tumbled to two-month lows, while the euro similarly bottomed at a more than one-month trough of $1.07675 against a stronger greenback.
The dollar index peaked at 104.18, its highest since December.