Aug 02 2016 06:53 AM
Currently it is only possible to search for a group name that starts with the entered search string but it is not possible to use wildcards or just have the system look for a part of the name that matches the search string. This is not supported in the Graph API either, so I have posted an idea on Uservoice to enable this functionality. Feel free to vote!
Aug 02 2016 06:08 PM
We do have a better group search in the Group Disovery module in OWA. We need to make it easier to get to.