Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
cac cua » cach cua, cac qua, ca cua
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
sach ky » sac ky, sach y, sach ty
cac cuc » cac cuoc, cac nuoc, cac cach
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh

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: tu sach ky dang xa hoi. hieu ve ((cac cuc) OR (cac cua)) ban hanh ((lai cua) OR (hai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. hieu ve ((cac cuc) or (cac cua)) ban hanh ((lai cua) OR (hai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu ve ((cac cuc) or (cac cua)) ban hanh ((lai cua) OR (hai cua)) tre*.