The East Asians are doing less well in the US because the cream of those respective countries can stay at home and contribute to their home countries, same with most (western) European emigrants to the US in the last 30 years. So, most emigrants from those regions are rather struggling at home and finding emigration as a good way out, while the best of India and the Philippines are emigrating to the US because their home country just doesn't provide them the fertile ground to prosper.
The odd of the whole picture are the Vietnamese, their economy and development at home is low and their emigrants to the US are not doing well either.
That's how I interpret this chart.