Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, le thanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
va tinh » may tinh
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
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: te sach ky nang x hoi. hieu van cac duc ((((va thanh) OR (ban thanh))) OR (va tinh)) dat cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu van cac duc ((((va thanh) OR (ban thanh))) or (va tinh)) dat cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu van cac duc ((((va thanh) OR (ban thanh))) or (va tinh)) dat cua tre*.