Unofficial exchange points sold the dollar at VND23,485, down 0.7% from Wednesday.
Vietcombank kept its rate unchanged at VND23,610.
Eximbank maintained the rate at VND23,580, while Techcombank sold the greenback 0.01% lower at VND23,607.
The State Bank of Vietnam kept the same reference rate at VND23,605.
The U.S. dollar index dipped 0.1%, while benchmark U.S. 10-year Treasury yields also fell. A weaker dollar makes greenback-priced bullion more appealing to other currency holders, Reuters reported.