Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
cuong cac » luong cac, trong cac, cuong ma
dung cong » dung trong
vang toan » van toan, quang toan, vang trang
dang toan » dang tran, dan toan, dung toan
ho chieu » theo chieu, hoc thieu, doi chieu
cong cac » cong tac, cong cau, trong cac

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 - thanh ((cong cac) OR (cuong cac)) dung cong ((vang toan) or (dang toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh ((cong cac) OR (cuong cac)) dung cong ((vang toan) OR (dang toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh ((cong cac) OR (cuong cac)) dung cong ((vang toan) or (dang toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh ((cong cac) OR (cuong cac)) dung cong ((vang toan) or (dang toan)) cau*.