SQL & PL/SQL

I am using sqlplus in unix...
I want to insert a few chinese characters in a table and should be able to retrieve it in sqlplus...

In unnix, I tried to set the NLS_LANG=_.UTF8
and LC_ALL=UTF-8

and in sqlplus
and alter session set NLS_LANGUAGE='SIMPLIFIED CHINESE';
alter session set NLS_TERRITORY=China;

But i am not able to see the chinese characters on the sqlplus screen to insert into the table ?

Any help is appreciated...thanks...