Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
thang cong » thanh cong, thang long, thong cong
canh sinh » canh tinh, canh binh, tinh sinh
van thang » van thanh, van khang, van hang
sinh van » sinh vat, dinh van, sinh va
cong san » cong tac
phan dau » phan tu, hang dau
phan cac » nhan cach, phan lap, phan van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chiet tach)) - canh sinh van thang cong san ((phan dau) OR (phan cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) OR (chiet tach)) - canh sinh van thang cong san ((phan dau) or (phan cac))~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) OR (chiet tach)) - canh sinh van thang cong san ((phan dau) or (phan cac))*.