Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
thanh de » hanh de, thanh ve, thanh do
va triet » va thiet, va trien, ve triet
van cam » van nam, van cau, van dam
van lam » van nam
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
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: toc sach y nang x hoi. hieu ((van cam) or (van lam)) tuc va thanh de ((cuu tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. hieu ((van cam) OR (van lam)) tuc va thanh de ((cuu tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu ((van cam) or (van lam)) tuc va thanh de ((cuu tre) or (va triet))*.