Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
interaction series » interactions series, interaction studies, interaction terms
case interaction » cases interaction, based interaction, scale interaction
fare integration » trade integration, die integration
supply case » supply cost, supply chain, supply curve
supply fare » supply farm, supply figure, supply curve

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply case interaction series. ) OR ( supply fare integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply case interaction series. ) or ( supply fare integration theories. ))*.