Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van cam » van nam, van cau, van dam
van lam » van nam
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. hieu ((van cam) or (van lam)) xuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu ((van cam) OR (van lam)) xuc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((van cam) or (van lam)) xuc va hanh di cua tre*.