Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
crowd integration » grid integration, trade integration, chain integration
making services » banking services, savings services, banking service
supply crowd » supply growth, supply cost, supply how
supply road » supply role, supply rural, supply reach
road making » road marking, road markings, road mapping

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 theories. ) or ( supply road making services. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply crowd integration theories. ) OR ( supply road making services. ))*.