Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo chau » theo chieu, theo phap, theo cap
hanh cong » thanh cong, hang cong, hanh dong
theo chu » theo chieu, cho chu, chao chu
cu nhung » cua nhung, tu nhung, co nhung
tan toan » tap toan, van toan, dan toan
cong cu » chung cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chau) or (theo chu)) tinh - hanh cong cu nhung cong ((tan toan) OR (tan tran)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chau) OR (theo chu)) tinh - hanh cong cu nhung cong ((tan toan) OR (tan tran)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chau) or (theo chu)) tinh - hanh cong cu nhung cong ((tan toan) OR (tan tran)) tap".
• Adding a wildcard symbol may retrieve word variants: ((theo chau) or (theo chu)) tinh - hanh cong cu nhung cong ((tan toan) OR (tan tran)) tap*.