Vietcombank sold the dollar at VND24,260, up 0.08% from Monday.
The State Bank of Vietnam's reference rate is at VND23,959, down 0.08%.
The dollar was stable at VND24,200 on the black market.
It has increased over the dong by 2.23% since the beginning of the year.
Globally the yen strengthened on Monday as comments from Bank of Japan (BOJ) Governor Kazuo Ueda stoked hopes that Japan could soon herald a new era away from negative rates, while the dollar was on the back foot ahead of this week's U.S. inflation reading, Reuters reported.
The Japanese currency rose nearly 0.8% at one point to touch a session-high of 146.66 per dollar in early Asia trade, boosted by weekend comments from Ueda that the central bank could end its negative interest rate policy when achievement of its 2% inflation target is in sight.
The dollar index, which capped last week with eight straight weeks of gains, its longest run since 2014, dipped slightly to 104.84.