Perhaps you should try some spelling variations:
ban nhanh » ban thanh, ban nhan, nhan nhanh
thai cua » than cua, tai cuc, tri cua
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
ve cam » ve cac, va cam, ve cai

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