Problem in greek translation

[konstantinos4]

I was trying to write something in greek, while making a new project but some fonts are not available in greek. To be more accurate i wrote ABCDΑΒΓΔ in Berlin Sans FB Demi and this is what is appeared:

[Puybaret]

Maybe the font Berlin Sans FB Demi doesn't define the drawing of Greek characters?
How does it work with an other more classical font, like Helvetica?