Perhaps you should try some spelling variations:
integration efforts » international efforts, conservation efforts
africa integration » african integration, africa's integration, american integration
irrigation system » irrigation systems, irrigation water, irrigation scheme
curve irrigation » surge irrigation, large irrigation, crop 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 africa integration efforts. ) OR ( supply curve irrigation system. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply africa integration efforts. ) or ( supply curve irrigation system. ))*.