Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thien hach » thien thanh, hien hanh
dong huong » dong thuong, dong duong, cong huong
hanh hang » thanh hang, hang hang, hanh han
toan cao » toan tap
toan ban » van ban
va dong » van dong, ha dong, xa dong

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 (thien hach)) - hanh hang va dong huong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (thien hach)) - hanh hang va dong huong dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (thien hach)) - hanh hang va dong huong dan ((toan cao) or (toan ban))*.