Perhaps you should try some spelling variations:
trinh nhung » trinh phuong, trinh dung
theo chieu » theo tieu, theo chu, thi chieu
hanh nhung » anh nhung, canh nhung, doanh nhung
ho chieu » hoc thieu, doi chieu, mot chieu
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan 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 (theo chieu)) sach - canh tranh ((hanh nhung) or (trinh nhung)) cong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - canh tranh ((hanh nhung) OR (trinh nhung)) cong tan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (theo chieu)) sach - canh tranh ((hanh nhung) or (trinh nhung)) cong tan toan tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (theo chieu)) sach - canh tranh ((hanh nhung) or (trinh nhung)) cong tan toan tap*.