Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chong cong » cong cong, thong cong, cuong cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
cua chong » cua cong, cua chung, cua khong
tang cua » mang cua, hang cua, tang luan
cong tan » cong tac, cong san, cong thanh
nhan tai » van tai, toan tai
hang tai » hang va, dung tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu manh) or (chieu sach)) - hanh tang cua chong cong tan ((nhan tai) OR (hang tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (chieu sach)) - hanh tang cua chong cong tan ((nhan tai) OR (hang tai)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (chieu sach)) - hanh tang cua chong cong tan ((nhan tai) OR (hang tai))".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chieu sach)) - hanh tang cua chong cong tan ((nhan tai) OR (hang tai))*.