Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
canh trinh » canh tranh, hanh trinh, canh tinh
trinh vat » trinh van, trinh luat, sinh vat
tong cong » trong cong, cong cong, dung cong
vat tong » vat trong, va tong, vat dong
cong san » cong tac
san than » sang than, san thanh, ban than
than cap » khan cap, thanh lap, thanh cac

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 (chieu sang)) - canh trinh vat tong cong san than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chieu sang)) - canh trinh vat tong cong san than cap.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chieu sang)) - canh trinh vat tong cong san than cap*.