Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
cua chong » cua cong, cua khong, cuu chong
cua chung » cua nhung, luan chung, luat chung
ho chieu » hoc thieu, doi chieu, mot chieu
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

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