Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh xay » trinh ky
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
san phan » san pham, van phan, dan phan
sat phan » sat nhan, vat phan, xuat 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 xay dung cong ((san phan) OR (sat phan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu nganh - canh trinh xay dung cong ((san phan) OR (sat phan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - canh trinh xay dung cong ((san phan) OR (sat phan)) cau*.