Vietcombank sold the greenback at VND25,820, a 0.12% increase from Tuesday. The currency rose 0.15% to around VND25,890 at unofficial exchange points.
The State Bank of Vietnam hiked its reference rate by 0.04% to VND25,611.
Globally, the dollar extended gains in Asian trade on Wednesday to approach a two-week high, after a hotter-than-expected inflation report and hawkish comments from Federal Reserve officials fuelled bets the US central bank will raise rates next month, Reuters reported.
The US dollar index, which measures the greenback's strength against a basket of six currencies, was 0.1% higher at 102.30, closing in on its highest since Oct. 29.
The euro and the British pound were flat at $1.1163 and $1.3346, respectively. Against the yen, the US dollar was unchanged at 158.82 yen. The Australian dollar was up 0.1% at $0.6875, edging back from a seven-month low, while the New Zealand dollar was flat at $0.5606.
"The rates market isn't simply pricing another hike," said Chris Weston, head of research at Pepperstone Group Ltd in Melbourne. "It's questioning how restrictive US monetary policy may ultimately need to become, and that's a far more consequential debate for risk assets."