Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu van
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
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: toc sach y hang xa hoi. ((hieu ve) OR (hieu va)) chat ((xuc van) OR (duc van)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y hang xa hoi. ((hieu ve) OR (hieu va)) chat ((xuc van) or (duc van)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach y hang xa hoi. ((hieu ve) OR (hieu va)) chat ((xuc van) or (duc van)) hanh vi cua tre*.