Perhaps you should try some spelling variations:
national integration » regional integration, national innovation, national integrity
integration theories » integration theory, integration through, integration efforts
integration schemes » irrigation schemes, integration some
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply crowd integration schemes. ) OR ( supply national integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply crowd integration schemes. ) or ( supply national integration theories. ))*.