Vietcombank sold the greenback at VND26,120, up 0.08% from Tuesday. The currency was down 0.04% to VND26,360 on the black market.
The State Bank of Vietnam raised its reference rate by 0.05% to VND24,947.
Globally, the dollar held gains on Wednesday on promising economic signs in the United States, Reuters reported.
Markets welcomed what appeared to be easing trade frictions between the U.S. and Europe while global bond markets settled down after a scary surge in long-term yields. U.S. consumer confidence surprised on the upside ahead of closely watched jobs figures on Thursday.
The dollar index, which tracks the greenback against a basket of currencies, rose 0.1%, adding to Tuesday's 0.6% rally. The greenback advanced 0.1% to $1.132 against the euro.
The yen was last little changed at 144.345 per dollar in early trading after dropping 1% on Tuesday in the wake of reports that Japan will consider trimming issuance of super-long bonds after a sharp rise in yields in recent weeks.