Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
cong dan » cong san, cong tan, huong dan
chan tu » han tu, chon tu, chai tu

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

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