Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
cham thuc » nham thuc, pham thuc, tham thuc
day hanh » day thanh, dao hanh, day manh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x ho. hieu ve cham thuc ((day hanh) or (day nhanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu ve cham thuc ((day hanh) OR (day nhanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu ve cham thuc ((day hanh) or (day nhanh)) di cua tre*.