Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
ban nhanh » ban hanh, ban thanh, ban nhan
thai cua » than cua, tai cuc, tri cua
cay phoi » cap phoi, cay cho, gap phoi
cam cua » ca cua, nam cua, cau cua
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tay hoi » tay ho, tao hoi, tay thai
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
ve cam » ve cham, ve cac, va cam

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

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