Perhaps you should try some spelling variations:
chiet tach » chieu sach
lieu tinh » trieu tinh, diep tinh, bien tinh
tranh qua » tranh cua, thanh qua, trinh qua
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
qua dung » quang dung, su dung, qua song
ban than » ban thanh, van thanh, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chiet tach) or (lieu tinh)) - canh tranh qua dung cong ((manh toan) or (ban than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (lieu tinh)) - canh tranh qua dung cong ((manh toan) OR (ban than)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) or (lieu tinh)) - canh tranh qua dung cong ((manh toan) or (ban than)) ban*.