Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu ve » hieu va, hieu van
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
chat xu » chat xuc, chao xu, chat huu
ve chat » va chat, van chat
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho
xu va » xu van, tu va, su va

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: ((su sach) OR (((te sach) OR (toc sach)))) ky nang x hoi. hieu ve chat xu va dinh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (((te sach) OR (toc sach)))) ky nang x hoi. hieu ve chat xu va dinh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (((te sach) OR (toc sach)))) ky nang x hoi. hieu ve chat xu va dinh va cua tre*.