Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
cua tre » cua te, cuu tre, cua triet
y sang » _ sang, duy sang
xuc va » tuc va, luc va, xac 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: su sach y sang ((ma hoa) OR (xa hoi)). hieu ve chat ((xuc va) OR (duc va)) hanh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y sang ((ma hoa) or (xa hoi)). hieu ve chat ((xuc va) OR (duc va)) hanh thai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach y sang ((ma hoa) or (xa hoi)). hieu ve chat ((xuc va) OR (duc va)) hanh thai cua tre*.