Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu manh » hieu nganh, dieu hanh, hien hanh
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
san phan » van phan, sat phan, dan phan

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 (chieu xanh)) - canh tranh van nhung cong ((san phan) OR (san pham)) dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - canh tranh van nhung cong ((san phan) OR (san pham)) dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (chieu xanh)) - canh tranh van nhung cong ((san phan) OR (san pham)) dau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu xanh)) - canh tranh van nhung cong ((san phan) OR (san pham)) dau*.