Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
integration power » integration some, integration process, international power
grid irrigation » drip irrigation, syria irrigation, crop irrigation
export trade » export share, export taxes, export price
supply grid » supply crowd, support grid

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

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