Perhaps you should try some spelling variations:
thanh nien » thanh vien, thanh nhan, thanh liem
nien cua » dien cua, tien cua, bien cua
so sang » so sanh, so dang, so lang
sang ky » sang kyo, dang ky, tang ky
qua cac » cua cac
tac ban » tai ban, cac ban, tay ban
tao ban » tao bac, cao bang, tao nhan
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "so sang ky nang x hoi. hieu qua cac ((tac ban) OR (tao ban)) thanh nien cua tre~".
• Adding a wildcard symbol may retrieve word variants: so sang ky nang x hoi. hieu qua cac ((tac ban) OR (tao ban)) thanh nien cua tre*.