Perhaps you should try some spelling variations:
crowd conservation » from conservation, good conservation, wood conservation
irrigation scheme » irrigation systems
flood irrigation » flood mitigation, led irrigation, farm irrigation
support flood » support food, support look, support follow
supply crowd » supply growth, supply cost, supply from

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

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