Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
integation volume » integration volume, creation volume, generation volume
gaps integation » gaps integrating, gis integration, means integration
supply scale » supply case, supply scheme, supply social
supply gaps » supply gap, supply gas

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( supply scale irrigation schemes. ) OR ( supply gaps integation volume. ))~".
• Adding a wildcard symbol may retrieve word variants: (( supply scale irrigation schemes. ) OR ( supply gaps integation volume. ))*.