This case is a bit tricky. This is what we have so far.
He went to school (a University exists there) or work in Binh Duong Province. His address for that location is 8th St. Phu Loi, Thu Dau Mot.
He came home for TET, a food festival, to Di An Town, Thanh Hoa Province.
He arrived home on 2/8. He became sick on 2/17.
He is back down South in Ho Chi Minh City Hospital.
His onset occurred down South.
The yellow postmark is just to show you where Thanh Hoa Province is.
Click on Map for enlargement.