To send a new campaign to the recipients who did not respond to a previous campaign, you can follow the following steps:
Go to Advanced Search, select the filter 'Campaign'.
Select the campaign to which these recipients were added earlier. In campaign status, choose status as 'Finished' as status and hit 'Done'.
You will see a list of candidates who were added to this campaign but who didn't reply.
Just select the list of candidates you want to add to the campaign using the checkbox on the candidate card or select all the candidates which were in the previous campaign but didn't reply.
Click on 'Add to campaign' button on the top and choose the new campaign to which you want to add the candidates.
That's it. The recipients who did not respond to a previous campaign will be added to the new campaign.