Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
thon hang » thon chang, thon lang, thong hoang
hang cong » dang cong, hang nong, bang cong
sang than » cang thang, dang thanh, sang tao
doc hieu » toc thieu, hoc thieu, hoc hien
van thon » van thong, van tho, van thuong
van than » van thanh, van thang, van tuan

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 manh - luan van thon hang cong ((van than) or (sang than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - luan van thon hang cong ((van than) OR (sang than)) cau*.