Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh trinh » canh tranh, hanh chinh
luat dong » luat cong, luat bong, luan dong
dong cong » duong cong, dung cong, dang cong
cong tac » cong ty
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) OR (chieu sach)) - hanh trinh luat dong cong tac ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (chieu sach)) - hanh trinh luat dong cong tac ((than cau) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (chieu sach)) - hanh trinh luat dong cong tac ((than cau) or (phan cau))".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) OR (chieu sach)) - hanh trinh luat dong cong tac ((than cau) or (phan cau))*.