Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
tang cua » mang cua, hang cua, tang luan
cong tac » cong ty
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: hoc hieu nganh - hanh tang cua nhung ((cong san) or (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu nganh - hanh tang cua nhung ((cong san) OR (cong tac)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - hanh tang cua nhung ((cong san) or (cong tac)) toan cao*.