Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong van » cong vang, cong san, song van
co sach » bo sach, cuon sach, hoc sach
tang ca » tang cua, hang ca, tang ma
doi co » doi bo, moi co, hoi co
tan ca » tan cua, dan ca, tan ha

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 co sach - canh tranh cua nhung cong van ((tan ca) OR (tang ca))~.
• Adding a wildcard symbol may retrieve word variants: doi co sach - canh tranh cua nhung cong van ((tan ca) or (tang ca))*.