Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
crowd integration » grid integration, rfid integration, beyond integration
internet services » internet service
gaps internet » das internet, paper internet, does internet
supply crowd » supply growth, supply cost, supply from
supply gaps » supply gap, supply gas

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 theories. ) OR ( supply gaps internet services. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply crowd integration theories. ) or ( supply gaps internet services. ))*.