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
cau sach » cao sach, hau sach, rau sach
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: chao ((tu sach) or (cau sach)) - canh tranh cua nhung cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: chao ((tu sach) OR (cau sach)) - canh tranh cua nhung cong van toan cao.
• Adding a wildcard symbol may retrieve word variants: chao ((tu sach) or (cau sach)) - canh tranh cua nhung cong van toan cao*.