Perhaps you should try some spelling variations:
migration efforts » mitigation efforts, mediation efforts, integration efforts
furrow irrigation » farm irrigation, crop irrigation, flood irrigation
irrigation scheme » irrigation systems
border migration » worker migration, der migration
supply border » supply order, supply under
supply furrow » supply from

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply border migration efforts. ) or ( supply furrow irrigation scheme. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply border migration efforts. ) OR ( supply furrow irrigation scheme. ))*.