HANOI — Had he never left Vietnam, Van Bau Nguyen would still be living with his parents. Even at 24, he would still share a bed with his brother and help his mother in the family’s Hanoi workshop until late at night. “In Vietnam, it’s hard to find a well-paying job,” Bau says, explaining what prompted him to leave. So, he moved 10,000 kilometers (6,200 miles) away to Germany. Bau’s mother told him that young people were needed in Europe, and an agency had assured him they could find him a training position in Germany. “I got to choose the state,” Bau recalls. “I liked Bavaria.” He had read on…