Perhaps you should try some spelling variations:
integration schemes » integration some, integration theories
irrigation schemes » irrigation scheme, irrigation systems
curve integration » care integration, fare integration, use integration
furrow irrigation » farm irrigation, crop irrigation, flood irrigation

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 curve integration schemes. ) OR ( supply furrow irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply curve integration schemes. ) or ( supply furrow irrigation schemes. ))*.