There are two ways you can do that:
Pressing the Reload Kontent Button
Doing that KM will pull content from the database that it hasn’t used in the current campaign. With every use of that button, it will do the same until it uses all of it and when it does that it will shuffle it so it will produce different variations.
Important: This affects only the cases when you are building content and copying directly from KontentMachine. When you are exporting or posting the content the whole database is used, and you don’t have to reload kontent.
Scraping for the same keyword
KM’s content building algorithm makes sure that when you scrape a second time for the same keyword the content will be coming from different sources.