Vietcombank sold the dollar 0.008% higher at VND26,369. The State Bank of Vietnam raised its reference rate 0.008% up to VND25,114.
On the black market the greenback gained 0.71% to VND27,073.
Globally the dollar slid broadly following renewed signs of strains in U.S.-China trade relations, which dented risk sentiment and left investors ducking for cover in traditional safe havens like the yen and the Swiss franc, Reuters reported.
The euro edged 0.14% higher against a weaker greenback to $1.1585, while sterling was up 0.12% to $1.3351.
The Australian dollar, often used as a proxy for risk appetite, suffered heavy losses to last trade 0.63% lower at $0.6475. The New Zealand dollar fell 0.5% to $0.5697.