Perhaps you should try some spelling variations:
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
quang luan » quan luan, quang tuan, quang uan
cong trong » cong thuong, duong trong, cong trinh
luan cong » luat cong, luong cong, luan chung
trong dan » trong dang, trong san, trong tan
dan than » dan chan, ban than, van than
than man » than ma, thanh san, tran manh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sang) or (chieu xanh)) - tinh quang luan cong trong dan than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (chieu xanh)) - tinh quang luan cong trong dan than man.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (chieu xanh)) - tinh quang luan cong trong dan than man*.