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