Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh van » thanh san, thanh toan, thanh phan
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
xuc va » duc va, tuc va, luc va
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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: ((so sach) OR (thuoc sach)) ky nang o hoi. lieu ((va cam) OR (va cao)) xuc va thanh van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (thuoc sach)) ky nang o hoi. lieu ((va cam) OR (va cao)) xuc va thanh van cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (thuoc sach)) ky nang o hoi. lieu ((va cam) OR (va cao)) xuc va thanh van cua tre*.