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