Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu sang » chieu sach, chieu xanh, hieu lang
hoc chieu » hoc thieu, ho chieu, hoc hien
tuong ung » huong ung, tong ung, duong ung
cong tran » cong tan, cong tuan, cong tren
cong toan » cong tan, cong hoan, cong tuan

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 sang - thanh tuong ung dung ((cong tran) OR (cong toan)) phan tu~.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - thanh tuong ung dung ((cong tran) or (cong toan)) phan tu*.