Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
va chet » va chiet, va che, va chat
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, v nang, may nang
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y nang) OR (ly nang)) ma hoi. lieu va chet duoc ((va hanh) or (va dao)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) ma hoi. lieu va chet duoc ((va hanh) OR (va dao)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) ma hoi. lieu va chet duoc ((va hanh) or (va dao)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ly nang)) ma hoi. lieu va chet duoc ((va hanh) or (va dao)) hai cua tre*.