Perhaps you should try some spelling variations:
day hang » dat hang, dai hang, day nang
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
hieu le » hieu ve, hieu he, hieu ly
hang di » hang doi, hang vi, hang dien
su sach » so sach
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
le nam » ly nam, he nam, le na
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
o hoi » co hoi, o hoc, o hai

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 ((xa hoi) or (o hoi)). hieu le nam thuc day hang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang ((xa hoi) OR (o hoi)). hieu le nam thuc day hang di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang ((xa hoi) or (o hoi)). hieu le nam thuc day hang di cua tre*.