Perhaps you should try some spelling variations:
lap thuoc » lam thuoc, phap thuoc, cay thuoc
su sach » vu sach
hai cua » thai cua, dai cua, hoi cua
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
nang o » nang co, nang ho, nang ro
va lap » va dap
o hoi » co hoi, o hoc, o hai

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: ((su sach) OR (so sach)) ky nang o hoi. hieu va lap thuoc ((va dinh) OR (va tinh)) hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang o hoi. hieu va lap thuoc ((va dinh) OR (va tinh)) hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang o hoi. hieu va lap thuoc ((va dinh) OR (va tinh)) hai cua tre*.