Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va
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 ly nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) OR (duc va)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ly nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) or (duc va)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ly nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) or (duc va)) hanh vi cua tre*.