Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
cua phuong » cuu phuong, cuc phuong, luan phuong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
can ban » toan ban
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: doi hieu lang - can ban cua phuong cong ((van tan) or (van ban)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - can ban cua phuong cong ((van tan) OR (van ban)) ban*.