Perhaps you should try some spelling variations:
thien van » thi van
hanh dai » hanh tai, hanh dao, vanh dai
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

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) OR (toc sach)) ty lang xa hoi. thien van nam ((thuc va) OR (thuc day)) hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty lang xa hoi. thien van nam ((thuc va) OR (thuc day)) hanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty lang xa hoi. thien van nam ((thuc va) OR (thuc day)) hanh dai cua tre*.