Perhaps you should try some spelling variations:
thanh bien » thanh vien, thanh nien, thanh hien
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
so sang » so sanh, so dang, so lang
sang ky » sang kyo, dang ky, tang ky
qua cac » cua cac
cac tac » cac toc, cac bac, cac dac
tac ban » tai ban, cac ban, tao ban
cua tre » cua te, cuu tre, dua tren
x hoi » o hoi, x ho, 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: so sang ky nang ((x hoi) OR (xa hoi)). hieu qua cac tac ban thanh bien ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sang ky nang ((x hoi) or (xa hoi)). hieu qua cac tac ban thanh bien ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: so sang ky nang ((x hoi) or (xa hoi)). hieu qua cac tac ban thanh bien ((cua tre) OR (cua triet))*.