Please HELP.....Problem storing Chinese in Oracle 8.0.5

I have set up a database to support Chinese characters with the following DML. When
I tried to insert chinese to a NVARCHAR2 column via sqlplus and PowerBuilder, I got

SQL> insert into chinese_test values('a',1,'§A¦n¶Ü','§Ú«Ü¦n'); insert into chinese_test values('a',1,'§A¦n¶Ü','§Ú«Ü¦n')

                                      *

The characters might not be ligible as i dont think SQLPLUS supports the display of Chinese.

Any help would be GREATLY appreciated.

Kit..

Name                            Null?    Type
 ------------------------------- -------- ----
 SOME_CHAR                       NOT NULL VARCHAR2(10)
 SOME_NUMBER                     NOT NULL NUMBER(6)
 SOME_CHINESE1                   NOT NULL NVARCHAR2(30)
 SOME_CHINESE2                   NOT NULL NVARCHAR2(60)