Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, mot chieu
csinh cua » chinh cua, tinh cua, trinh cua
ho chieu » theo chieu, hoc thieu, mot chieu
sinh cua » manh cua, dinh cuu, sinh va
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: ((ho chieu) OR (doi chieu)) sach - hanh ((csinh cua) or (sinh cua)) nhung cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - hanh ((csinh cua) OR (sinh cua)) nhung cong tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) sach - hanh ((csinh cua) or (sinh cua)) nhung cong tac toan ban".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) sach - hanh ((csinh cua) or (sinh cua)) nhung cong tac toan ban*.