PHUONG NGUYEN  A specially converted Vietnam Airlines passenger plane equipped with ventilators and state doctors has returned from Equatorial Guinea to Hanoi, carrying 140 Vietnamese workers infected with COVID-19. The plane, which left on Monday night for 27-hour, 21,000-kilometre (13,000 mile) round trip to the town of Bata in the West African country, arrived in the capital Hanoi, where infected patients were taken to a nearby hospital for treatment. "We are all prepared," Pham Ngoc Thach, director of the National Hospital of Tropical Diseases campus just outside Hanoi, told Reuters. "One hundred ventilators, medicine and other equipment for testing and…