Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham luc » nhan luc, cham cuu, chat lua
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hanh ly » khanh ly, hanh ky, hang ly
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
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.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((y nang) or (ky nang)) ma hoi. hieu ve ((cham luc) or (cham soc)) va hanh ly cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y nang) OR (ky nang)) ma hoi. hieu ve ((cham luc) OR (cham soc)) va hanh ly cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (ky nang)) ma hoi. hieu ve ((cham luc) or (cham soc)) va hanh ly cua tre*.