Perhaps you should try some spelling variations:
investment detection » investment protection, investment destination, investment attraction
private development » privacy development, private developers, promote development
detection series » detection systems, detection system
impact series » impact stories, impact studies, imprint series
can private » das private, scale private, cost private

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( can private investment detection series ) OR ( a private development impact series ))~.
• Adding a wildcard symbol may retrieve word variants: (( can private investment detection series ) or ( a private development impact series ))*.