Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
lanh tranh » canh tranh, lan tranh, hanh trinh
hieu manh » chieu xanh, dieu hanh, hien hanh
vat dung » van dung, viet dung, mat duong
cong san » cong tac
san phan » san pham, van phan, sat phan
phan lap » phan dau
va dung » van dung, va duong, va ung

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

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