Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
hieu van » hieu va, thien van, lieu va
va danh » va dinh, va hanh, dia danh
van cac » van hac, van cau, van bac
su sach » vu sach
cua tre » cua te, cuu tre, cua triet
so sach » so sanh, bo sach, co sach
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
vi cua » vai cua, di 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: ((su sach) OR (so sach)) y nang x hoi. hieu van cac thuc ((va danh) OR (va dan)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang x hoi. hieu van cac thuc ((va danh) OR (va dan)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang x hoi. hieu van cac thuc ((va danh) OR (va dan)) vi cua tre*.