Perhaps you should try some spelling variations:
migration process » registration process
furrow irrigation » farm irrigation, crop irrigation, flood irrigation
irrigation scheme » irrigation systems
male migration » female migration, mass migration, a migration
supply male » supply case, supply role, supply market

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

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