Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
dung sach » duong sach, dung sai, dung cac
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
toan ban » van ban

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

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