Perhaps you should try some spelling variations:
ban mach » ban sach, ranh mach, ban hanh
ban manh » ban hanh, van manh, ban anh
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » 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) OR (hieu va)) cam duc ((ban manh) OR (ban mach)) hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. ((hieu ve) or (hieu va)) cam duc ((ban manh) OR (ban mach)) hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. ((hieu ve) or (hieu va)) cam duc ((ban manh) OR (ban mach)) hai cua tre*.