Perhaps you should try some spelling variations:
nang lai » nang tai, mang lai, nang cai
va thanh » ban thanh, va tinh, le thanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lai hoi » dai hoi, lai hoa, lai roi
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cao, va cai

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 ky nang lai hoi. hieu ((va cam) OR (va cac)) xuc ((va thanh) or (gia thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang lai hoi. hieu ((va cam) OR (va cac)) xuc ((va thanh) OR (gia thanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang lai hoi. hieu ((va cam) OR (va cac)) xuc ((va thanh) or (gia thanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang lai hoi. hieu ((va cam) OR (va cac)) xuc ((va thanh) or (gia thanh)) dai cua tre*.