Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh de » hanh de, thanh ve, thanh do
su sach » so sach
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc
va am » va lam, va cam
thuc » thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) y nang ((x hoi) or (o hoc)). lieu va am thuc vat thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang ((x hoi) OR (o hoc)). lieu va am thuc vat thanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang ((x hoi) or (o hoc)). lieu va am thuc vat thanh de cua tre*.