This guide will enable you to use contains IN multiple values which might come handy when you need to refer to multiple values.
Out of the box, you can use contains only per 1 value inserted in the field
However, using event segmentation that you would firstly need to setup, there is workaround.
First, as demonstration lets setup event segmentation that would be segmented based on campaign names.
This will allow us do following setup:
Which basically will check if campaign name is either in segment 1 OR segment 2 - similarly as it would if contains would be usable for more values at once.