Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
tranh va » tranh van, trinh va, thanh va
trang va » tran van, hang va
dan toan » van toan, dan than, xuan toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - canh ((tranh va) OR (trang va)) dung cong ((dan toan) or (manh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh ((tranh va) OR (trang va)) dung cong ((dan toan) OR (manh toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - canh ((tranh va) OR (trang va)) dung cong ((dan toan) or (manh toan)) cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh ((tranh va) OR (trang va)) dung cong ((dan toan) or (manh toan)) cau*.