Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
van hac » van hoc, van ha, van hai
vai cua » dai cua, hai cua, lai cua
van cac » van cau, van bac, dan cac
da nang » cam nang, kha nang, cao nang
cua tre » cua te, cuu tre, cua triet
tac va » tac da, tac xa, tuc va
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: ((su sach) OR (do sanh)) da nang x hoi. hieu ((van cac) OR (van hac)) tac va thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (do sanh)) da nang x hoi. hieu ((van cac) OR (van hac)) tac va thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (do sanh)) da nang x hoi. hieu ((van cac) OR (van hac)) tac va thanh vai cua tre*.