Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trinh » canh tranh, hanh chinh
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
tran ban » tranh ban, tran van, toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) OR (chiet tach)) - hanh trinh vat nhung ((cong tan) or (cong tac)) tran ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - hanh trinh vat nhung ((cong tan) OR (cong tac)) tran ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chiet tach)) - hanh trinh vat nhung ((cong tan) or (cong tac)) tran ban".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chiet tach)) - hanh trinh vat nhung ((cong tan) or (cong tac)) tran ban*.