Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
flood irrigation » flood mitigation, led irrigation, farm irrigation
china national » china's national, ghana national, china regional
supply china » supply chains, supply chain
supply flood » supply food, supply from, 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 china national poverty. ) or ( supply flood irrigation schemes. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply china national poverty. ) OR ( supply flood irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (( supply china national poverty. ) or ( supply flood irrigation schemes. ))*.