Perhaps you should try some spelling variations:
sinh thai » dinh thi
hinh thai » tinh thai, dinh thi, chinh tai
chat xuc » chat huu, cam xuc, chao xu
van chat » cao chat
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty sang » ty xang, ty hang, duy sang
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 sang ((ma hoa) or (xa hoi)). hieu van chat xuc va ((hinh thai) OR (sinh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty sang ((ma hoa) OR (xa hoi)). hieu van chat xuc va ((hinh thai) OR (sinh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty sang ((ma hoa) or (xa hoi)). hieu van chat xuc va ((hinh thai) OR (sinh thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty sang ((ma hoa) or (xa hoi)). hieu van chat xuc va ((hinh thai) OR (sinh thai)) cua tre*.