Vietcombank sold the dollar at VND23,650 Wednesday, down 0.04% from Tuesday. The rate is now hovering at the lowest in seven weeks.
Techcombank let the greenback slide 0.05% to VND23,667.
Eximbank maintained the dollar at VND23,670.
The State Bank of Vietnam has lowered its reference rate by 0.01% to VND23,603.
The dollar was sold at VND23,550 on the black market, same as Tuesday.
It has fell against the dong by 0.34% since the beginning of the year.
Globally the safe-haven U.S. dollar struggled to find its footing on Wednesday following two days of losses as global financial markets regained a measure of stability on hopes a full-blown banking crisis can be averted, Reuters reported.
The dollar index, which tracks the currency against six major peers, edged 0.08% higher to 102.57 in Asian trading, following drops of about 0.3% in each of the past two sessions. The weakness comes despite a rise in U.S. Treasury yields, also the result of ebbing demand for the safest assets.
The yen remained volatile in the run-up to the end of the Japanese fiscal year on Friday. The dollar jumped 0.59% to 131.68 yen, and touched a one-week high of 131.80.
The yen had dropped 0.5% the previous day, when it uncharacteristically moved in the opposite direction with long-term U.S. Treasury yields.