That's a really subjective wide net. For international reputation alone, you're probably aiming for a Top 15 school; however, some schools may be more well known in Vietnam than in other countries (for example, Ivy League schools vs Darden/Duke/Michigan). If you're looking to return to Vietnam or another Asian country post-graduation, you'll have to prioritize schools accordingly.
Beautiful campus is a personal choice. Have you been to the US to visit schools? Are you going to enjoy a more rural school like Cornell/Darden or something in the city like Columbia or NYU? Even so, Columbia has more of a campus whereas NYU uses the city as its campus -- you might like that or not and think that's beautiful or not; we can't tell you that.
I didn't get into school specifics here, but good luck with your research.
Thank you so much aerien! Lets me make my idea clearer
1. Strong background in Finance (at least in US students' eyes)
2. Have many financial aids
3. The weather is not so harsh
4. Few Asian students
Top 15 schools, of course, are my dreams but I strongly focus on financial aids as one essential criteria since I cannot afford tuition and hardly gain scholarship from these top schools. So I may look other options in top 20-40 schools to get financial aids. Could you please recommend some options based on my basic background?