Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham lao » cham lai, cham vao, chap lao
hanh vai » hanh vi, hanh va, hanh tai
nang noi » nang doc
chai lao » chap lao, chai va, ha lao
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang hoc
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y ((nang co) or (nang noi)) hoi. hieu ve ((cham lao) OR (chai lao)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((nang co) OR (nang noi)) hoi. hieu ve ((cham lao) OR (chai lao)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y ((nang co) or (nang noi)) hoi. hieu ve ((cham lao) OR (chai lao)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((nang co) or (nang noi)) hoi. hieu ve ((cham lao) OR (chai lao)) va hanh vai cua tre*.