How to Store Non English Words In Oracle Database

Question

Insert into Tamil_language values (1, N'மோதிரம்')
Insert into Tamil_language values (2, 'மோதிரம்')

Select * from Tamil_language

Output

i      j
----------- ----------
1      மோதிரம்
2      ???????

How to do this using store procedure in Oracle Database?
How To Add 'N' Prefix For the Store procedure Parameter?
Please Help me if any one know this.