Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
xuc van » luc van, xuc ban, thuc van
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
y hang » ly hang, ty hang, yu hang
vi cua » vai cua, di cua

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: doc sach y hang xa hoi. hieu ve chat ((xuc van) OR (duc van)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: doc sach y hang xa hoi. hieu ve chat ((xuc van) or (duc van)) hanh vi cua tre*.