Vietcombank sold the dollar at VND23,770 Wednesday, up 0.08% from Tuesday.
Eximbank sold the greenback at VND23,740, up 0.04%.
But Techcombank lowered its rate by 0.02% to VND23,765, down and ACB let the dollar slide by 0.21% to VND23,850.
The State Bank of Vietnam set it reference rate 0.02% lower at VND23,620.
The dollar is sold at VND23,970 on the black market, down 0.04%.
The greenback has strengthened over the dong by 3.71% since the beginning of the year.
The dollar index edged up 0.1%, making greenback-priced gold more expensive for overseas buyers, while benchmark 10-year yields slipped from the over one-month highs hit in the previous session, Reuters reported.