Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
vat hanh » vat thanh, van hanh, va hanh
lam thuc » lam thuoc, am thuc, nam thuc
su sach » so sach
doi cua » dai cua, hoi cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, vu khach
va lam » van lam, va lap
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

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)). hieu va lam thuc vat hanh doi 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)). hieu va lam thuc vat hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang ((x hoi) or (o hoc)). hieu va lam thuc vat hanh doi cua tre*.