Perhaps you should try some spelling variations:
irrigation systemss » irrigation systems, irrigation system, irrigation schemes
integration scheme » integration schemes, integration schengen, integration some
design irrigation » basin irrigation, deficit irrigation, drip irrigation
supply design » supplies design, support design, supply decisions

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 chain integration scheme. ) OR ( supply design irrigation systemss. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply chain integration scheme. ) or ( supply design irrigation systemss. ))*.