Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
thuc day » thuc dan, thuc vat
thu day » thu da, thu dac, thu dai
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (hoc sach)) ky nang x hoi. lieu va nam ((thu day) OR (thuc day)) thanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky nang x hoi. lieu va nam ((thu day) OR (thuc day)) thanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) ky nang x hoi. lieu va nam ((thu day) OR (thuc day)) thanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ky nang x hoi. lieu va nam ((thu day) OR (thuc day)) thanh doi cua tre*.