Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vu sach » vu bach, su sach, vu khach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hieu ve » hieu van
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van 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: vu sach v nang x hoi. ((hieu ve) OR (hieu va)) nam thuc ((va hanh) OR (va danh)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach v nang x hoi. ((hieu ve) or (hieu va)) nam thuc ((va hanh) OR (va danh)) di cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach v nang x hoi. ((hieu ve) or (hieu va)) nam thuc ((va hanh) OR (va danh)) di cua tre*.