Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
ho chieu » theo chieu, hoc thieu, 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 (doi chieu)) sang - canh tranh cua nhung ((cong manh) or (cong danh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sang - canh tranh cua nhung ((cong manh) OR (cong danh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) sang - canh tranh cua nhung ((cong manh) or (cong danh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) sang - canh tranh cua nhung ((cong manh) or (cong danh)) toan tap*.