Perhaps you should try some spelling variations:
integration series » integration theories, integrating services, integration schemes
grid integration » trade integration, _ integration, data integration
case irrigation » scale irrigation, change irrigation, canal irrigation
supply grid » supply crowd, support grid
supply case » supply cost, supply chain, supply curve
systems. » system.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply grid integration series. ) or ( supply case irrigation systems. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply grid integration series. ) OR ( supply case irrigation systems. )).
• Adding a wildcard symbol may retrieve word variants: (( supply grid integration series. ) or ( supply case irrigation systems. ))*.