Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
integration efforts » international efforts, conservation efforts
fare integration » trade integration, die integration
supply regional » support regional, supply seasonal
supply fare » supply farm, supply case, supply figure

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 fare integration theories. ) OR ( supply regional integration efforts. ))~".
• Adding a wildcard symbol may retrieve word variants: (( supply fare integration theories. ) OR ( supply regional integration efforts. ))*.