Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, thong cong, hang cong
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
hang nong » thang long, han tong
doc hieu » toc thieu, hoc thieu, hoc hien
tinh cua » trinh cua, sinh cua, tinh chat
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu nganh - hanh tinh cua ((nhung cong) or (hang nong)) san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh tinh cua ((nhung cong) OR (hang nong)) san toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - hanh tinh cua ((nhung cong) or (hang nong)) san toan cao*.