Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang cua » mang cua, hang cua, tang luan
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
tran van » luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu manh) or (chiet tach)) - hanh tang cua cong ((cong tan) or (cong tac)) tran van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chiet tach)) - hanh tang cua cong ((cong tan) OR (cong tac)) tran van.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chiet tach)) - hanh tang cua cong ((cong tan) or (cong tac)) tran van*.