Perhaps you should try some spelling variations:
hinh thai » sinh thai, dinh thi, chinh tai
tinh thai » sinh thai, tinh toan, tinh chat
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
van cac » van hac, van bac, dan cac
xang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty xang xa hoi. hieu ((van cac) or (van cau)) xuc va ((hinh thai) OR (tinh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang xa hoi. hieu ((van cac) OR (van cau)) xuc va ((hinh thai) OR (tinh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty xang xa hoi. hieu ((van cac) or (van cau)) xuc va ((hinh thai) OR (tinh thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty xang xa hoi. hieu ((van cac) or (van cau)) xuc va ((hinh thai) OR (tinh thai)) cua tre*.