Mr. Trung is the Head of the Department of Occupational Diseases and a Principal Researcher-Institute of Occupational Health and the Environment. In addition, he is a lecturer in occupational health training: participating in the training of doctors and technicians specializing in occupational health, training in occupational health and first aid. He is also a certified trainer of Occupational Disease Specialist; training lecturers granting occupational health certificates to subjects 5; visiting lecturer at Trade Union University; Visiting lecturer at Hanoi Medical University.