Perhaps you should try some spelling variations:
nhiet nang » nhiet dong, viet nang, nhieu tang
hanh trinh » canh tranh, hanh chinh
hoc nhiet » hoc thiet, hoc nghien, hoc hien
cua dung » cua dang, cua dong, qua dung
cong van » cong vang, song van, cong tan
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nhiet nang - hanh trinh ((cua dung) or (cua cong)) ((cong van) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nhiet nang - hanh trinh ((cua dung) OR (cua cong)) ((cong van) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc nhiet nang - hanh trinh ((cua dung) or (cua cong)) ((cong van) or (cong san)) toan cau*.