Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
school international » china international, action international, how international
integration social » international social
crowd integration » grid integration, trade integration, chain integration
survey school » nursery school, supply school
supply crowd » supply growth, supply cost, supply how

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply crowd integration social. ) or ( survey school international efforts. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply crowd integration social. ) OR ( survey school international efforts. )).
• Adding a wildcard symbol may retrieve word variants: (( supply crowd integration social. ) or ( survey school international efforts. ))*.