Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh mang » nhanh mang, hanh trang, nhanh lang
nong dan » nong san, nguong dan, huong dan
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, than cap
mang va » mang vua, hang va, bang va

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