Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hieu manh » chieu xanh, dieu hanh, hien hanh
canh manh » lanh manh, canh tranh, cach mang
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
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.

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