Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
thanh tung » thanh cong
tong cong » trong cong, cong cong, dung cong
cong dan » cong san, cong tan, huong dan
gian cao » gian co, giai cao, gian cam
gian cac » gian dan, gian cua
tung va » trung va, tuong va, dung va
va tong » va thong, va tuong, va trong

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