How I can recovery answers deleted accidentally?

I deleted all answers from my form and I them.

Did you deleted all of your submissions? Unfortunately it is not possible to recover deleted submissions. 

A workaround might be trying to check the email Notifications if they are still available on your email.

You can also check email history log on your account and try to find previously submitted data. 

How to View All Your Form Email History

Hope this will help. Let us know if you need further assistance.