https://www.pewresearch.org/global/2015/06/23/1-americas-global-image/
America’s image is mostly positive among the Asian nations polled. Particularly large majorities see the U.S. favorably in the Philippines (92%), South Korea (84%) and Vietnam (77%).
It’s from 2015 but more recent polls have found similar data IIRC
79% of people polled in Vietnam chose the US in the “Preferred alignment choice in U.S.-China rivalry” which is a different metric obviously but still points towards the same idea
Edit: According to Luna Oi, Pew Research Center is a neoliberal think tank that cannot be trusted on anything about Vietnam
(Speaking to your edit: yeah, I was/am hoping that these Pew & Brookings polls of Vietnamese sentiment are simply bad & wrong.)