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
dung cong » dung trong
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung
ty toan » tap toan, huy toan, tam toan
ly toan » le toan, ly hoan, ly tran

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 manh cua dung cong ((ty toan) OR (ly toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu manh) OR (hieu nganh)) - canh manh cua dung cong ((ty toan) OR (ly 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 cong ((ty toan) OR (ly toan)) cao".
• Adding a wildcard symbol may retrieve word variants: toc ((hieu manh) or (hieu nganh)) - canh manh cua dung cong ((ty toan) OR (ly toan)) cao*.