Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
cong khong » cong thong, cong thuong, trong khong
hieu lang » hieu quang, nhieu tang, hieu van
tranh cua » doanh cua, manh cua
khong anh » khuong anh, khong hanh, hong anh
anh toan » manh toan, anh tuan, thanh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (chieu sang)) - canh tranh cua cong khong anh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sang)) - canh tranh cua cong khong anh toan ban*.