Perhaps you should try some spelling variations:
integration series » integration theories, integrating services, integration schemes
integration theory » integration through, information theory, integration report
grid integration » trade integration, _ integration, data integration
supply trade » supply side
supply case » supply cost, supply chain, supply curve
supply grid » supply crowd, support grid

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 trade) OR (supply case)) integration series. ) OR ( supply grid integration theory. ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((supply trade) OR (supply case)) integration series. ) or ( supply grid integration theory. ))~".
• Adding a wildcard symbol may retrieve word variants: (( ((supply trade) OR (supply case)) integration series. ) or ( supply grid integration theory. ))*.