The greenback inched up 0.15% to VND26,000 at unofficial exchange points. Vietcombank kept its rate unchanged at VND26,080.
Globally the dollar was lower on Friday and on track for its first weekly fall in more than a month against the euro and the yen, reflecting fading expectations for a Federal Reserve rate hike and lingering concerns about an AI-driven equity selloff, Reuters reported.
"What I found most interesting [on Friday] and more broadly this week, is how closely the dollar has been tied to the AI trade," said Matt Weller, global head of market research at StoneX in Michigan.
"Usually if we see a sell off in tech stocks you would expect the greenback to get a safe-haven bid. We are seeing an element of that into bonds, but the dollar is actually falling."
The dollar index, which measures it against six major peers, fell 0.17% to 101.87 and was set for a 0.35% weekly drop.