Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
"supply _ integration schemes." » "supply _ integration schengen.", "supply _ irrigation schemes.", "supply _ integration regimes."
supply crowd » supply growth, supply cost, supply from
supply grid » supply great, support grid

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("((supply grid) or (supply crowd)) integration theories.") or ("supply _ integration schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("((supply grid) or (supply crowd)) integration theories.") OR ("supply _ integration schemes.")).
• Removing quotes may allow a broader search: (( ((supply grid) or (supply crowd)) integration theories. ) or ( supply _ integration schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("((supply grid) or (supply crowd)) integration theories.") or ("supply _ integration schemes."))*.