Perhaps you should try some spelling variations:
ban banh » ban hanh, ban danh, ban thanh
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
ban anh » ban hanh, ban danh, bang anh
sach ky » sach y, sach ty, sach kem
xay hoi » xa hoi, tay hoi, cay phoi
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sac ky)) dang xay hoi. hieu va cac du ((ban banh) OR (ban anh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) dang xay hoi. hieu va cac du ((ban banh) OR (ban anh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sac ky)) dang xay hoi. hieu va cac du ((ban banh) OR (ban anh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) dang xay hoi. hieu va cac du ((ban banh) OR (ban anh)) hai cua tre*.