Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
cam thuc » am thuc, nam thuc, cam thu
dao hanh » dao thanh, dang hanh, ban hanh
vu sach » vu bach, su sach, vu khach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
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 ((ty nang) OR (ky nang)) x ho. hieu va cam thuc ((dao hanh) or (day nhanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty nang) OR (ky nang)) x ho. hieu va cam thuc ((dao hanh) OR (day nhanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ty nang) OR (ky nang)) x ho. hieu va cam thuc ((dao hanh) or (day nhanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty nang) OR (ky nang)) x ho. hieu va cam thuc ((dao hanh) or (day nhanh)) di cua tre*.