Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
tang cua » mang cua, hang cua, tang luan
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
hanh cat » hanh cac, hanh luat, nhanh cay
khan cap » khan ap, than cap, khoan cam

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 tang cua dung cong san ((hanh cat) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh tang cua dung cong san ((hanh cat) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - hanh tang cua dung cong san ((hanh cat) or (khan cap))*.