Greek language problem in database after import

[Prestag0od]

With a Module I imported data from oscommerce (Latin1) and the Greek entries look like this inside database  "óõììðëçñþíáôá ãéá õíááßêåò". In Backend they dont appeared at all. How can I convert them to look right in the prestashop data base? The data base is UTF-8, the data was in latin1. I tried with Notepad ++ to change to UTF-8 but nothing happens. I also tried to change the collation in the dbase .. again nothing. If I export the imported table and choose ISO 8859-1 and open it in Notepad ++ I can see Greek correctly but when i imported it back the Greek are messed up again.

When I copy-paste them through notepad ++ to phpMyAdmin, (SQL query and run)  are normally imported and show fine! But I can not do this for all the tables when the most have thousands of entries! Any suggestion please?

Edited March 3, 2018 by Prestan0ob (see edit history)