Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
tieu sach » chieu sach, dien sach, te sach
trinh dan » trinh han, trinh san, trinh da
nang cong » nang song, dang cong, bang cong
dan nang » da nang, van nang, dai nang
van than » van thanh, van thang, van tuan
ban hang » ngan hang

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 tieu sach - hanh trinh dan nang cong ((van than) OR (ban hang)) cao~.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh trinh dan nang cong ((van than) or (ban hang)) cao*.