Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
x hoi » o hoi, x ho, 5 hoi
ve am » va am

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 v nang ((x hoi) or (xa hoi)). hieu ve am thuc day hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach v nang ((x hoi) OR (xa hoi)). hieu ve am thuc day hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach v nang ((x hoi) or (xa hoi)). hieu ve am thuc day hanh vi cua tre*.