Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
ngung cong » nhung cong, dung cong, nganh cong
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
doc hieu » toc thieu, hoc thieu, hoc hien
cong van » cong vang, cong san, song van
phan cac » nhan cach, phan lap, phan van
phan dau » phan tu, hang dau
chat » nhat, phat

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 chat ngung cong van ((phan cac) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh tinh chat ngung cong van ((phan cac) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - hanh tinh chat ngung cong van ((phan cac) or (phan dau))*.