Perhaps you should try some spelling variations:
interaction series » interactions series, interaction studies, interaction terms
irrigation system » irrigation systems, irrigation water, irrigation scheme
cost interaction » host interaction, host interactions, robot interaction
data irrigation » delta irrigation, canal irrigation, water irrigation
supply cost » supply costs

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 data irrigation system. ) OR ( supply cost interaction series. ))~".
• Adding a wildcard symbol may retrieve word variants: (( supply data irrigation system. ) OR ( supply cost interaction series. ))*.