Perhaps you should try some spelling variations:
reintegration process » registration process, migration process
crowd reintegration » towards reintegration
social irrigation » local irrigation, scale irrigation, social mitigation
irrigation system » irrigation systems, irrigation water, irrigation scheme
supply crowd » supply growth, supply cost, supply how

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( supply crowd reintegration process. ) OR ( supply social irrigation system. ))~".
• Adding a wildcard symbol may retrieve word variants: (( supply crowd reintegration process. ) OR ( supply social irrigation system. ))*.