Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
canh trang » canh tranh, hanh trang, banh trang
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
trang va » tran van, hang va
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: theo ((chieu sach) or (chieu sang)) - canh trang va ((nhung cong) OR (dung cong)) tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chieu sang)) - canh trang va ((nhung cong) OR (dung cong)) tan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (chieu sang)) - canh trang va ((nhung cong) OR (dung cong)) tan than cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chieu sang)) - canh trang va ((nhung cong) OR (dung cong)) tan than cau*.