Perhaps you should try some spelling variations:
poverty interventions » policy interventions, early interventions, government interventions
interventions efforts » intersectional efforts, interventions before, international efforts
irrigation schemes » irrigation scheme, irrigation systems
how irrigation » crop irrigation, from irrigation, high irrigation

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 poverty interventions efforts. ) OR ( supply how irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply poverty interventions efforts. ) or ( supply how irrigation schemes. ))*.