Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tac, cac nuoc
dao dai » dat dai, dao dan, tao dai
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
va dao » ca 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: ((tu sach) OR (thu sach)) ky nang x hoi. hieu va ((cac tuc) OR (cac tu)) va dao dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. hieu va ((cac tuc) OR (cac tu)) va dao dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x hoi. hieu va ((cac tuc) OR (cac tu)) va dao dai cua tre*.