Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu lang » chieu sang, hieu lang, chi lang
cong thanh » dong thanh, cong trinh, truong thanh
cac nhan » ca nhan, cac nha, cam nhan
cong tan » cong tac, cong san, cong ty
toan cao » toan ban, toan tap
cac han » cac phan, cac dan, cac van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu lang - thanh cong ((cac han) OR (cac nhan)) ((cong tan) OR (cong thanh)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu lang - thanh cong ((cac han) or (cac nhan)) ((cong tan) OR (cong thanh)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: theo chieu lang - thanh cong ((cac han) or (cac nhan)) ((cong tan) OR (cong thanh)) toan cao*.