Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
va cai » va cac, va bai, va dai
xang x » nang x
di cua » dai cua, doi cua, de cua
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, x ho

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 xang x hoi. hieu ((va cai) or (va cao)) thuc ((ban hanh) or (day nhanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty xang x hoi. hieu ((va cai) OR (va cao)) thuc ((ban hanh) OR (day nhanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ty xang x hoi. hieu ((va cai) or (va cao)) thuc ((ban hanh) or (day nhanh)) di cua tre*.