My unsupported theory as to what might be going on here with Vietnam, India, and Philippines, is that people consider the USA as a nice migration destination.

There are large asian migrant communities in the US, probably most people in those three countries would have a direct contact or even relative who lives in the US. They would see pictures of them and hear about life in the US and perceive it to be better than their own.

Most people here reading this question think about politics, but plenty of people living in the Philippines unable to buy fuel or gas due to shortages, who would still think "favourably" of the US.