Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
integration theories » integration theory, integration through, integration efforts
chain international » china international, can international, sharing international
grid integration » trade integration, _ integration, data integration
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 grid integration theories. ) OR ( supply chain international efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply grid integration theories. ) or ( supply chain international efforts. ))*.