Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thi chieu » thi chien, thi hieu, theo chieu
ho chieu » theo chieu, hoc thieu, doi chieu
manh cua » doanh cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
ban cua » ban quan

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 cua) OR (ban cua)) nhung cong tac toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (thi chieu)) tinh - canh ((manh cua) OR (ban cua)) nhung cong tac toan tap~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (thi chieu)) tinh - canh ((manh cua) OR (ban cua)) nhung cong tac toan tap*.