Perhaps you should try some spelling variations:
theo chieu » ho chieu, theo chu, thi chieu
tang luan » dung luan
huong cua » dung cua
tong cong » trong cong, cong cong, dung cong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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) OR (theo tieu)) sach - hanh ((tang luan) or (huong cua)) tong cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo tieu)) sach - hanh ((tang luan) OR (huong cua)) tong cong tap toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (theo tieu)) sach - hanh ((tang luan) or (huong cua)) tong cong tap toan ban".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (theo tieu)) sach - hanh ((tang luan) or (huong cua)) tong cong tap toan ban*.