Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, thong cong, hang cong
chinh cua » chinh ca, chinh sua, hinh cua
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
toan cao » toan ban
toan tai » doanh tai, toan ban, von tai
toan tap » toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh chinh cua nhung cong tac ((((toan cao) OR (toan tai))) OR (toan tap))~.
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - hanh chinh cua nhung cong tac ((((toan cao) or (toan tai))) or (toan tap))*.