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