Perhaps you should try some spelling variations:
social integration » global integration, financial integration, regional integration
integration theory » integration through, information theory, innovation theory
existing services » exporting services, testing services, nursing services
crowd existing » crowd editing, from existing, co existing
supply crowd » supply growth, supply cost, supply from

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