Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thi chieu » thi chien, thi hieu, theo chieu
canh manh » lanh manh, canh tranh, van manh
cua nhung » va nhung
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
ho chieu » theo chieu, hoc thieu, doi chieu
toan tap » toan ban

You may be able to get more results by adjusting your search query.

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