how can i restore permantly deleted photos

You can find your deleted photos in the Recently Deleted folder in the Photo app. Images that have been in that folder for more than 30 days are automatically deleted. If you have emptied the folder yourself, the images unfortunately cannot be restored.

You can find more information here:

If you're missing photos or videos in the Photos app - Apple Support

“Restore” and “permanently deleted” contradict each other.

Permanently deleted photos are … permanently deleted and therefore gone.