Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
irrigation system » irrigation systems, irrigation water, irrigation scheme
data irrigation » delta irrigation, canal irrigation, water irrigation
drop irrigation » drip irrigation, crop irrigation, from irrigation
supply drop » supply from, supply europe, supply crowd

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

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