Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
hung thong » chung thong, hung thang, dung thong
cong quang » luong quang, thong quang, duong quang
quang toan » quang tuan, quang tran, quang doan
dung cong » dung trong
thong va » thong cua, truong va, thong qua
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sang)) - hung thong va dung cong quang toan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sang)) - hung thong va dung cong quang toan cau*.