Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
son truong » so truong, con truong, sinh truong
thanh son » thanh san, thanh cong, thanh toan
truong ca » truong cao, truong va, trong ca
toan ban » van ban
ca toan » cua toan, va toan, bai toan

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 thanh son truong ca toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (chieu xanh)) - tinh quang thanh son truong ca toan ban.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (chieu xanh)) - tinh quang thanh son truong ca toan ban*.