Vietcombank sold the dollar at VND25,471, up 0.02% from Wednesday.
The State Bank of Vietnam raised its reference rate by 0.02% to VND24,259.
The greenback was steady on the black market at VND25,650.
Globally the yuan came under renewed pressure against the dollar on Thursday, giving up some initial gains as markets reflected on a Reuters report that China may weaken the yuan to weather the risk of U.S. trade tariffs, Reuters reported.
The yuan was 0.03% lower at 7.2637 to the dollar after trading in a range of 7.2565 to 7.2677.
China's top leaders and policymakers are reportedly considering allowing the yuan to weaken in 2025 as they brace for higher U.S. tariffs when Donald Trump returns to the White House.