Perhaps you should try some spelling variations:
integrating policies » international policies, integrating countries, immigration policies
irrigation schemes » irrigation scheme, irrigation systems
gaps integrating » _ integrating, 2 integrating
supply gaps » supply gap, supply pipes
drip » drop, trip

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

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