HAI PHONG, Vietnam — Inside VinFast’s sprawling factory complex in northern Vietnam, sparks fly from robotic welding arms behind safety fences as workers inspect panels and assemble vehicles moving overhead along the line. The scene captures both the industrial ambition and manufacturing drive of a young automaker trying to turn Vietnam’s homegrown electric vehicle brand into a global contender. The Hai Phong factory, about two hours from Hanoi, sits at the center of VinFast’s effort to make its