Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban benh » san benh, ban banh, can benh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
ba benh » va benh, bo benh, bach benh
cua tre » cua te, cuu tre, cua triet
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: tu sach ky nang x hoi. hieu van cam duc ((ban benh) or (ba benh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van cam duc ((ban benh) OR (ba benh)) di cua tre*.