There's a lot of value in helping out locally as well.

I don't have as much lived experience of someone in Vietnam as I do someone in my community. Nor do I understand the language or the culture. There's more overhead in making it happen and there will likely be a lot of things I'll never take into account or understand. On the other hand, I know what it's like living in a HCOL state where many jobs don't pay enough for a family to survive and have struggled in my own past. Could my money have more purchasing power elsewhere? Sure. And they're still people in my community struggling and I have the power to help them and a greater understanding of what they're facing. Community seems to get discounted a lot in the discussion around effective altruism and I think that's unfortunate.