Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hieu manh » chieu xanh, dieu hanh, hien hanh
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((hieu manh) or (hieu nganh)) - canh tranh ((cua dung) OR (cua dong)) cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu manh) OR (hieu nganh)) - canh tranh ((cua dung) OR (cua dong)) cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((hieu manh) or (hieu nganh)) - canh tranh ((cua dung) OR (cua dong)) cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: toc ((hieu manh) or (hieu nganh)) - canh tranh ((cua dung) OR (cua dong)) cong tac toan cao*.