Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
khanh luan » khanh thuan, doanh luan, hang luan
nhung cong » dung cong, thong cong, hang cong
hanh luan » hang luan, hanh luat, han luan
dan toan » van toan, dan than, manh toan

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