Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
cam cua » nam cua, cau cua, lam cua
danh vi » hanh vi, danh di, danh va
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty xang xa hoi. hieu ve ((cam cua) or (ca cua)) ban ((danh vi) or (dinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang xa hoi. hieu ve ((cam cua) OR (ca cua)) ban ((danh vi) OR (dinh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang xa hoi. hieu ve ((cam cua) or (ca cua)) ban ((danh vi) or (dinh vi)) cua tre*.