Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh ly » khanh ly, hanh ky, hang ly
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
su cham » su pham, tu cham, qua cham
dai hoi » dai hoc, dai hai, dai moi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
cuu va » cuu van, cuu ve
ma hoi » mai hoi, xa hoi, ma hoa
ly cua » le 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 nang ((ma hoi) OR (dai hoi)). hieu ((su cham) OR (vu cham)) cuu va hanh ly cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((ma hoi) or (dai hoi)). hieu ((su cham) OR (vu cham)) cuu va hanh ly cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((ma hoi) or (dai hoi)). hieu ((su cham) OR (vu cham)) cuu va hanh ly cua tre*.