Perhaps you should try some spelling variations:
nhiet tach » chiet tach
hanh trang » thanh trung, canh tranh, hanh trinh
hoc nhiet » hoc thiet, hoc nghien, hoc hien
chua dong » cua dong, ha dong, huy dong
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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 tach - hanh trang ((chua dong) or (cua ban)) ((cong dan) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nhiet tach - hanh trang ((chua dong) OR (cua ban)) ((cong dan) OR (cong tan)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc nhiet tach - hanh trang ((chua dong) or (cua ban)) ((cong dan) or (cong tan)) toan cau*.