Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hoac khong » hoa khong, hoc khong, hay khong
khong cong » thong cong, khong cang, chong cong
hanh hang » thanh hang, hang hang, hanh han
hang hoac » hang hoa, hang khoa, nang hoc
cac doanh » cac dan, cac dang, van doanh
tac danh » sach danh, cac dan, tac dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (chieu sang)) - hanh hang hoac khong cong ((tac danh) OR (cac doanh)) bao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chieu sang)) - hanh hang hoac khong cong ((tac danh) OR (cac doanh)) bao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (chieu sang)) - hanh hang hoac khong cong ((tac danh) OR (cac doanh)) bao".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chieu sang)) - hanh hang hoac khong cong ((tac danh) OR (cac doanh)) bao*.