Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
dinh ca » dinh cac, dinh cua, dinh cao
va dinh » van dinh, va kinh, va tinh
sach ty » sach y, sach tu, sach thu
vu cham » va cham, vu kham, tu cham
mai hoi » mai khoi, dai hoi, lai hoi
ty sang » ty xang, ty hang, duy sang
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va
ca cuu » cap cuu, cua cuu, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty sang ((mai hoi) or (xa hoi)). hieu ((vu cham) or (vien bach)) xuc va dinh ca cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty sang ((mai hoi) OR (xa hoi)). hieu ((vu cham) OR (vien bach)) xuc va dinh ca cuu tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty sang ((mai hoi) or (xa hoi)). hieu ((vu cham) or (vien bach)) xuc va dinh ca cuu tre*.