Perhaps you should try some spelling variations:
dang xay » dang van, van xay
xay phoi » cay phoi, cap phoi, tay hoi
ban hanh » ban hang
ban lanh » ban linh, ban anh, ban banh
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cam duc » cam xuc, cao duc, nam duoc
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang xay phoi. hieu ve ((cam duc) OR (pham duc)) ((ban lanh) or (ban hanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay phoi. hieu ve ((cam duc) OR (pham duc)) ((ban lanh) OR (ban hanh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xay phoi. hieu ve ((cam duc) OR (pham duc)) ((ban lanh) or (ban hanh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay phoi. hieu ve ((cam duc) OR (pham duc)) ((ban lanh) or (ban hanh)) hai cua tre*.