Perhaps you should try some spelling variations:
dinh dai » dinh dat, sinh dai, dinh dao
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, 5 hoi

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) OR (x ho)). hieu va cac luc va dinh 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) OR (x ho)). hieu va cac luc va dinh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ((x hoi) OR (x ho)). hieu va cac luc va dinh dai cua tre*.