Perhaps you should try some spelling variations:
thang cong » thanh cong, thang long, hang cong
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
canh sinh » canh tinh, canh binh, tinh sinh
ho chieu » theo chieu, hoc thieu, doi chieu
sinh van » sinh vat, dinh van, sinh va
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 - canh sinh van ((thang cong) OR (thong cong)) san ((phan dau) OR (phan cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - canh sinh van ((thang cong) OR (thong cong)) san ((phan dau) or (phan cac))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - canh sinh van ((thang cong) OR (thong cong)) san ((phan dau) or (phan cac))*.