How to do linguistic sort query using Toplink API

Hi,
I want to write a Toplink query using linguistic sort like the following SQL,
SELECT * from emp_name
where ename LIKE 'müller%'
ORDER BY NLSSORT(ename, 'NLS_SORT=german')
I got two questions:
(1) how to implement "ORDER BY NLSSORT(name, 'NLS_SORT=german')" using Toplink API.
(2) I built linguistic index,
CREATE INDEX nls_index ON emp_name (NLSSORT(ename, 'NLS_SORT = german'));
But SQL plan shows that LIKE clause does not use index. I wonder how to enforce query with LIKE clause to use such linguistic index.
Thanks for your help in advance.
-Evan

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