Perhaps you should try some spelling variations:
khong cang » thong cong, hong bang, khong dung
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
canh manh » lanh manh, canh tranh, cach mang
manh cua » doanh cua, ban cua
san toan » van toan, dan toan, manh toan
toan ban » van ban

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: doi chieu sang - canh manh cua ((trong cong) OR (khong cang)) san toan ban~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - canh manh cua ((trong cong) or (khong cang)) san toan ban*.