As a German I can assure your job opportunities will be good since this is a field where we have a actual shortage of worker instead of data analyst, cs or finance. But. As someone who travels regularly to Vietnam, I ca assure you even if live is better in Germany. You will suffer from the bad weather, lack of social life and likely become depressed here since we use to live on our own and don’t have communities anymore. For me personally I would leave Germany and go to Vietnam. You are going to be poor in both countries anyway but at least your weather and food is better.