Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thieu sach » chieu sach, thien hach, theo sach
hieu cach » hieu cac, chieu sach, hieu ca
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, dan than, manh toan
ban than » ban thanh, van thanh, ban hang
va dung » van dung, va duong, vat dung

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 cach)) - hanh trinh va dung cong ((dan toan) or (ban than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - hanh trinh va dung cong ((dan toan) OR (ban than)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu cach)) - hanh trinh va dung cong ((dan toan) or (ban than)) cau*.