Perhaps you should try some spelling variations:
doi chieu » doi chi, ho chieu, mot chieu
canh manh » lanh manh, canh tranh, cach mang
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san toan » van toan, dan toan, manh 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: ((doc hieu) or (doi chieu)) xanh - canh manh ((cua khong) OR (hua khong)) cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (doi chieu)) xanh - canh manh ((cua khong) OR (hua khong)) cong san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (doi chieu)) xanh - canh manh ((cua khong) OR (hua khong)) cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (doi chieu)) xanh - canh manh ((cua khong) OR (hua khong)) cong san toan ban*.