Here is a little explanation from Google about (not set) and (not provided).
Not Set vs Not Provided
Not Set: The ’keyword’ (not set) simply identifies traffic that doesn’t arrive via a particular keyword and hence may not come via any search at all. This includes traffic coming from email, referral sites, or even things like Google Images.
Not Provided: The keyword (not provided) describes organic searches that are being hidden from your view, to provide a measure of privacy for users. In 2011, Google began encrypting results from SSL searches (secure searches from users who are logged in to their Google Accounts or using the Firefox search bar)
So, If you see (not set) or (not provided) in Google analytics campaigns add-on, Dashboard, or any other place within Analytify plugins, consider that this (not set) or (not provided) traffic is not from a particular keyword.
If you know any other explanation of this, please share it with us in the comment.