Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
ban benh » san benh, ba benh, ban banh
hieu van » hieu va, thien van, lieu va
bo benh » so benh, o benh, ba benh
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) y nang x hoi. hieu van cam duc ((ban benh) OR (bo benh)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) y nang x hoi. hieu van cam duc ((ban benh) or (bo benh)) di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) y nang x hoi. hieu van cam duc ((ban benh) or (bo benh)) di cua tre*.