Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh huong » thanh huong, anh huong, manh huong
huong cua » dung cua
nhung don » nhung van, nhung bo
dung cong » dung trong
toan cao » toan tap
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: theo chieu sach - hanh huong cua ((nhung don) or (dung cong)) trinh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh huong cua ((nhung don) OR (dung cong)) trinh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh huong cua ((nhung don) or (dung cong)) trinh ((toan cao) or (toan ban))*.