Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
dung trung » quang trung, dung ung, dung tren
hieu manh » chieu xanh, dieu hanh, hien hanh
hanh bang » anh bang, hanh mang, lanh bang
bang luan » tang luan, hang luan, dung luan
dang than » dang thanh, sang than, dang tran
than cao » toan cao, thai cao, than cap

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) OR (hieu manh)) - hanh bang luan ((dung trong) or (dung trung)) dang than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (hieu manh)) - hanh bang luan ((dung trong) OR (dung trung)) dang than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu nganh) OR (hieu manh)) - hanh bang luan ((dung trong) or (dung trung)) dang than cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) OR (hieu manh)) - hanh bang luan ((dung trong) or (dung trung)) dang than cao*.