Shenzhen is 1 hour ahead of Ho Chi Minh City
Best overlap: 8:00 AM to 5:00 PM in Ho Chi Minh City is 9:00 AM to 6:00 PM in Shenzhen.
Both offices are open during 8:00 AM to 5:00 PM Ho Chi Minh City time, which is 9:00 AM to 6:00 PM in Shenzhen. With 9 hours in common, treat scheduling almost as if the two cities were in the same region.