Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
irrigation scheme » irrigation systems
data integration » data integrity
crowd irrigation » crop irrigation, flood irrigation, from irrigation
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 data integration theories. ) or ( supply crowd irrigation scheme. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply data integration theories. ) OR ( supply crowd irrigation scheme. )).
• Adding a wildcard symbol may retrieve word variants: (( supply data integration theories. ) or ( supply crowd irrigation scheme. ))*.