Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
so sach » so sanh, bo sach, co sach
hoc cac » hoc cao
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
va cua » va chua, via cua, ca cua
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (hoc cac)) ky nang o hoi. lieu va cam duc va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (hoc cac)) ky nang o hoi. lieu va cam duc va thanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (hoc cac)) ky nang o hoi. lieu va cam duc va thanh va cua tre*.