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
nhung cong » dung cong, thong cong, hang cong
cong quang » luong quang, thong quang, duong quang
tang luan » dung luan
thanh mau » hanh mau, thanh san, thanh hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) OR (chieu xanh)) - hanh ((thong quan) or (tang luan)) nhung cong quang thanh mau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu xanh)) - hanh ((thong quan) OR (tang luan)) nhung cong quang thanh mau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (chieu xanh)) - hanh ((thong quan) or (tang luan)) nhung cong quang thanh mau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (chieu xanh)) - hanh ((thong quan) or (tang luan)) nhung cong quang thanh mau*.