Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
cac thuong » cac truong, cac phuong, cac chuong
cong thanh » dong thanh, cong trinh, cong tan
tranh cac » trinh cac, thanh cac, tranh cai
cong manh » cong danh, duong manh, hoang manh
ho chieu » hoc thieu, doi chieu, mot chieu
toan tap » toan ban

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) OR (theo chieu)) tinh - canh tranh cac thuong ((cong manh) or (cong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) tinh - canh tranh cac thuong ((cong manh) OR (cong thanh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (theo chieu)) tinh - canh tranh cac thuong ((cong manh) or (cong thanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (theo chieu)) tinh - canh tranh cac thuong ((cong manh) or (cong thanh)) toan tap*.