Greek alphabetically order

Hello,
I am building a site as a dictionary for a Greek dialect. I want to order the words alphabetically but there is a mistake because of the accents.

Example:
1) If the accent is NOT in the first letter, works well.
Ακούω
Απλά
2) But if the second word has an accent in the first letter it changes, but I don’t want this.
Άπλα
Ακούω

So, what I want is the letters with accent and without accent to be equal and the algorithm to combine the second letter etc

I hope you understood my question.

Thanks,
Giannis L.

PS: sorry for my English