Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
bang cong » dang cong, bang song, hang cong
trinh va » trinh van, trinh vat, trinh ve
van toan » van tuan, van thanh, manh toan
va bang » va nang, va lang, va ban
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (dieu hanh)) - hanh trinh va bang cong ((van toan) or (van tan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (dieu hanh)) - hanh trinh va bang cong ((van toan) OR (van tan)) ban.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (dieu hanh)) - hanh trinh va bang cong ((van toan) or (van tan)) ban*.