Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
chieu sach » chinh sach, chiet tach, chieu sang
dung cong » dung trong
chu sach » cau sach, thu sach, chuc hach
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than tap » toan tap, han tap, phan tap
va dung » van dung, va duong, vat dung

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu sach) OR (chieu sach)) - ((hanh trinh) OR (canh tranh)) va dung cong tan than tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu sach) OR (chieu sach)) - ((hanh trinh) or (canh tranh)) va dung cong tan than tap~".
• Adding a wildcard symbol may retrieve word variants: theo ((chu sach) OR (chieu sach)) - ((hanh trinh) or (canh tranh)) va dung cong tan than tap*.