Perhaps you should try some spelling variations:
nhiem trong » nghiep trong
phoi nhiem » hoi nhiem, chon nhiem, thai nhiem
hanh trang » thanh trung, canh tranh, hanh trinh
trang va » tran van, hang va
cong tan » cong tac, cong thanh, cong ty
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: phoi nhiem trong - hanh trang va nhung ((cong tan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phoi nhiem trong - hanh trang va nhung ((cong tan) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: phoi nhiem trong - hanh trang va nhung ((cong tan) or (cong san)) toan cau*.