How to retrieve non-english characters from a query

Hello,
My apologies if this post is not in its proper place, but I was a bit confused where to add it.
I'm running a query using SQL Developer on a table which contains several companies names from many different countries, and one of the checks I need to make to ensure data consistency is to search for all rows which the name of company contains special or non-english characters (like ç, ã, ä as example).
I don't know what can I use to do this. I tried to collate using NLS_SORT but it didn't work.
Is there someway to select only the rows that contain these special or non-english characters, excluding from the results the rows that only have english characters? Please have in mind that we have many languages in this table.
The field I would like to make the conditions on is VARCHAR2.
Please let me know if there is any extra information I should provide you so that you can help me.
Thank you in advance for the help.
Regards,
Luís

Hi Luis,
My apologies if this post is not in its proper place, but I was a bit confused where to add it.This is the Forum for the SQL Developer Data Modeler product.
I suggest you try using the SQL and PL/SQL Forum: PL/SQL
David

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