Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
hanh tang » hanh trang, anh tang, hanh mang
dan toan » manh toan, xuan toan, dien toan
van toan » van tuan, van tan, van thanh
dan than » dan chan, ban than, van than
tang va » trang va, tang van, thang va

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 - hanh tang va nhung cong ((((dan toan) OR (van toan))) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh tang va nhung cong ((((dan toan) OR (van toan))) OR (dan than)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh tang va nhung cong ((((dan toan) OR (van toan))) or (dan than)) cau*".