Perhaps you should try some spelling variations:
nhiet tach » chiet tach
hanh trinh » canh tranh, hanh chinh
cua thuong » cua truong, cua phuong, ca thuong
hoc nhiet » hoc thiet, hoc nghien, hoc hien
cua thong » cua khong, cua tong, suat thong
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than ban » thanh ban, toan ban, than man

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nhiet tach - hanh trinh ((cua thong) OR (cua thuong)) cong tac than ban~".
• Adding a wildcard symbol may retrieve word variants: hoc nhiet tach - hanh trinh ((cua thong) OR (cua thuong)) cong tac than ban*.