Vietcombank sold the dollar at VND24,500, down 0.04% from Wednesday.
The State Bank of Vietnam lowered its reference rate by 0.08% to VND23,920.
The dollar went up 0.08% to VND24,740 on the black market.
It has increased against the dong by 3.24% since the beginning of the year.
Globally the dollar found a footing on Thursday as a sudden end to a strong rally for U.S. stocks had investors looking for safety and as an unexpected fall in British inflation hit the pound, Reuters reported.
Sterling suffered its sharpest drop in two months overnight after British inflation dived below forecasts to an annual 3.9% in October, its lowest for two years.
The euro was stable at $1.0943. The yen found support at 143.5 per dollar, after having lost ground on Tuesday when the Bank of Japan left its ultra-easy policy settings unchanged.