Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
tieu sach » dien sach, te sach, viet sach
nang cong » nang song, dang cong, bang cong
trinh da » trinh dan, trinh dao, trinh do
van than » van thanh, van thang, van tuan
ban hang » ngan hang
da nang » cam nang, kha nang, cao nang

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) OR (chieu sach)) - hanh trinh da nang cong ((van than) OR (ban hang)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sach) OR (chieu sach)) - hanh trinh da nang cong ((van than) or (ban hang)) cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu sach) OR (chieu sach)) - hanh trinh da nang cong ((van than) or (ban hang)) cao*.