Perhaps you should try some spelling variations:
factor interaction » actor interaction, actor interactions, factor integration
interaction series » interactions series, interaction studies, interaction terms
irrigation schemes » irrigation scheme, irrigation systems
case irrigation » scale irrigation, use irrigation, change irrigation
supply factor » supply factors, supply sector
supply case » supply cost, supply chain, 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 factor interaction series. ) OR ( supply case irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply factor interaction series. ) or ( supply case irrigation schemes. ))*.