Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, chong cong
hieu lang » chieu sang, hieu quang, nhieu tang
cua khong » hua khong, cua phuong, cua thuong
canh ban » can ban, canh dan, canh van
ho hieu » ho chieu, hoi hieu, nho hieu
ban cua » ban quan
van tan » van tuan, van tai, van thanh

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 - canh ban cua khong cong ((van tan) or (van ban)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh ban cua khong cong ((van tan) OR (van ban)) ban.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh ban cua khong cong ((van tan) or (van ban)) ban*.