Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
danh vi » dinh vi, danh di, danh va
van dau » van dao, phan dau
van cau » van hau, van chat, toan cau
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va

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: so sach ky tang xa hoi. lieu ((van cau) OR (van dau)) luc va ((danh vi) OR (hanh vi)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky tang xa hoi. lieu ((van cau) OR (van dau)) luc va ((danh vi) or (hanh vi)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: so sach ky tang xa hoi. lieu ((van cau) OR (van dau)) luc va ((danh vi) or (hanh vi)) cuu tre*.