Perhaps you should try some spelling variations:
thanh tien » thanh vien, thanh nien, thang tien
ban thanh » ban hanh, ban hang
tien cua » trien cua, tiep cua, dien cua
so sang » so sanh, so lang, so bang
tac ban » tai ban, cac ban, tao ban
cac tac » cac toc, cac bac, cac dac
qua cac » cua cac
cua tre » cua te, cuu tre, cua triet
so dang » su dang, so dan, so dung
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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