Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc day » thuc dan, thuc vat
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
thuc va » thuc vat, thuc dan
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. lieu va cao ((thuc va) OR (thuc day)) hanh dai ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. lieu va cao ((thuc va) OR (thuc day)) hanh dai ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. lieu va cao ((thuc va) OR (thuc day)) hanh dai ((cua tre) or (cua triet))*.