Perhaps you should try some spelling variations:
trong chuan » thong chuan, trong chan, trong thuan
chieu sach » chinh sach, chieu sang, chieu xanh
manh trong » manh truong, anh trong, manh trung
chuan bang » chua bang, chuan trang, can bang
cong thanh » dong thanh, cong trinh, cong tan
cong manh » cong danh, duong manh, hoang manh
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) OR (chiet tach)) - manh trong chuan bang ((cong manh) or (cong thanh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - manh trong chuan bang ((cong manh) OR (cong thanh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chiet tach)) - manh trong chuan bang ((cong manh) or (cong thanh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chiet tach)) - manh trong chuan bang ((cong manh) or (cong thanh)) toan ban*.