Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
thon lang » nhon lang, tho lang, thong mang
lang cong » dang cong, bang cong, hang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
van thon » van thong, van than, van tho
san than » sang than, san thanh, ban than

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