Perhaps you should try some spelling variations:
integration volume » integration von
spate irrigation » scale irrigation, water irrigation, surge irrigation
gaps integration » gaps integrating, gis integration, means integration
supply spate » supply system, supply side, supply water
supply gaps » supply gap, supply gas
systems. » system.

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: (( supply spate irrigation systems. ) OR ( supply gaps integration volume. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply spate irrigation systems. ) or ( supply gaps integration volume. ))*.