Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
integration series » integration theories, integrating services, integration schemes
grid integration » trade integration, _ integration, data integration
support grid » support agri, support grant, support group
supply china » supply chains, supply chain

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: (( support grid integration series. ) OR ( supply china international efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (( support grid integration series. ) or ( supply china international efforts. ))*.