Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
trang va » hang va
tran van » luan van
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - hanh ((trang va) or (tran van)) dung cong ((dan toan) OR (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((trang va) OR (tran van)) dung cong ((dan toan) OR (dan than)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trang va) or (tran van)) dung cong ((dan toan) OR (dan than)) cau*".