Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
canh trinh » canh tranh, hanh trinh, anh trinh
canh tinh » hanh tinh, manh tinh, canh tranh
hoc hieu » hoc thieu, hoc hien, doc hieu
san phan » san pham, sat phan, dan phan
van phan » van phong, van thanh, luan 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 nganh - ((canh trinh) or (canh tinh)) xay dung trong ((san phan) OR (van phan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu nganh - ((canh trinh) OR (canh tinh)) xay dung trong ((san phan) OR (van phan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu nganh - ((canh trinh) or (canh tinh)) xay dung trong ((san phan) OR (van phan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - ((canh trinh) or (canh tinh)) xay dung trong ((san phan) OR (van phan)) cau*.