Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
cong vang » cong lang, cong quang, cong ngang
van nang » van quang, van ban, van dong
cong van » cong san, song van, cong tan
ban cao » bao cao, ban can, ban co

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