Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hoi hieu » hoi phieu, hoi tieu, moi hieu
cong cua » cong cu, dong cua, huong cua
manh cua » doanh cua, ban cua
cong dan » cong san, cong tan, huong dan
toan tai » toan tap, doanh tai, toan cao
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: hoi hieu lang - nhanh ((cong cua) OR (manh cua)) nhung cong dan ((toan tai) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - nhanh ((cong cua) or (manh cua)) nhung cong dan ((toan tai) or (toan ban))*.