Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
va danh » va dinh, va dan, va hanh
sach ky » sac ky, sach y, sach ty
qua cam » qua cham, qua cac, qua ca
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, va hoi
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 ky lang ((ha hoi) OR (xa hoi)). hieu qua cam xuc ((ban hanh) OR (va danh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang ((ha hoi) OR (xa hoi)). hieu qua cam xuc ((ban hanh) or (va danh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang ((ha hoi) OR (xa hoi)). hieu qua cam xuc ((ban hanh) or (va danh)) vi cua tre*.