Perhaps you should try some spelling variations:
interaction schemes » integration schemes, interaction studies, interaction series
actor interaction » matter interaction, matter interactions, fiction interaction
support drip » support deep, support during, support crops
supply actor » supply factors, supply sector, supply donor
systems. » system.

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

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