Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
curve international » survey international, care international, turkey international
integration theory » integration through, information theory, integration report
chain integration » trade integration, data integration, grid integration

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 chain integration theory. ) OR ( supply curve international efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply chain integration theory. ) or ( supply curve international efforts. ))*.