Perhaps you should try some spelling variations:
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
luan nang » luan van, van nang, luan san
nang nong » nang song, hang nong, nang dong
anh dung » anh dong, anh huong, sach dung
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) or (chieu xanh)) - anh dung luan nang nong ((dan toan) OR (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (chieu xanh)) - anh dung luan nang nong ((dan toan) OR (dan than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) or (chieu xanh)) - anh dung luan nang nong ((dan toan) OR (dan than)) ban".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) or (chieu xanh)) - anh dung luan nang nong ((dan toan) OR (dan than)) ban*.