Perhaps you should try some spelling variations:
interaction series » interactions series, interaction studies, interaction terms
irrigation scheme » irrigation systems
cost interaction » host interaction, host interactions, robot interaction
needs irrigation » led irrigation, fed irrigation, under irrigation
supply cost » supply costs

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply cost interaction series. ) or ( supply needs irrigation scheme. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply cost interaction series. ) OR ( supply needs irrigation scheme. )).
• Adding a wildcard symbol may retrieve word variants: (( supply cost interaction series. ) or ( supply needs irrigation scheme. ))*.