Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
theo sach » thuoc sach, te sach, theo lich
cua nhung » va nhung
hieu luc » hieu luat, hieu qua
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban
hieu ca » hieu cac, hieu cua, hieu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((theo sach) or (((hieu luc) or (hieu ca)))) - canh tranh cua nhung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (((hieu luc) OR (hieu ca)))) - canh tranh cua nhung cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (((hieu luc) or (hieu ca)))) - canh tranh cua nhung cong san toan ban*.