Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, mot chieu
tranh cua » doanh cua, manh cua
cua nhung » va nhung
ho chieu » theo chieu, hoc thieu, mot chieu
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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