Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
cong ngang » cong nhan, cong quang, cong lang
tranh cua » doanh cua, manh cua
cong vang » cong lang, cong quang, cong san
cua dang » cua cong, cua ban
toan tap » toan 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 ((thieu sach) or (hieu ca)) - canh tranh cua dang ((cong vang) or (cong ngang)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu ca)) - canh tranh cua dang ((cong vang) OR (cong ngang)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu ca)) - canh tranh cua dang ((cong vang) or (cong ngang)) toan tap*.