Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
mat cua » ma cua, manh cua, mang cua
dat cua » dai cua, day cua, dan cua
va tinh » may tinh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
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 ((ban thanh) OR (va tinh)) ((dat cua) OR (mat 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 ((ban thanh) or (va tinh)) ((dat cua) OR (mat cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu van cac duc ((ban thanh) or (va tinh)) ((dat cua) OR (mat cua)) tre*.