Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » canh tranh, hanh chinh
van thong » van thuong, va thong, van thang
van phong » van dong, hai phong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than man » than ma, thanh san, tran manh

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sach - hanh trinh ((van thong) or (van phong)) cong dan than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - hanh trinh ((van thong) OR (van phong)) cong dan than man*.