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, nhung don
trinh vat » trinh van, trinh luat, sinh vat
hang cong » dang cong, hang nong, bang cong
san chan » san chang, dan chan, san chay
chan tu » phan tu, han tu, chon 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) OR (hang cong)) san chan 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) OR (hang cong)) san chan 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) OR (hang cong)) san chan tu".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chiet tach)) - canh trinh vat ((nhung cong) OR (hang cong)) san chan tu*.