Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
tong cong » trong cong, cong cong, dung cong
tung cua » trung cua, tuong cua, dung cua
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu manh) or (chieu sach)) - thanh ((tung cua) or (dung luan)) tong cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu manh) OR (chieu sach)) - thanh ((tung cua) OR (dung luan)) tong cong tan than cau.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu manh) or (chieu sach)) - thanh ((tung cua) or (dung luan)) tong cong tan than cau*.