Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
ban lanh » ban linh, ban anh, ban banh
dang xay » dang van, van xay
xay phoi » cay phoi, cap phoi, tay hoi
tu sach » thu sach, te sach, tu cach
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ky dang » ky nang, ky danh
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

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