Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
integration schemes » irrigation schemes, integration some, integration theories
crowd integration » grid integration, trade integration, chain integration
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 schemes. ) or ( supply _ international efforts. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply crowd integration schemes. ) OR ( supply _ international efforts. )).
• Adding a wildcard symbol may retrieve word variants: (( supply crowd integration schemes. ) or ( supply _ international efforts. ))*.