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
cau luc » cau truc, cau phuc
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
luc ca » luc cao, luc cua, luc va
ca dan » cac dan, 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 cau luc ca dan dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x hoi. hieu va cau luc ca dan dai cua tre*.