Perhaps you should try some spelling variations:
"smart and sustainable public environment" » "smart and sustainable policy environment", "smart and sustainable built environment", "smart and sustainable policies environment", "smart and sustainable public environmental", "smart and sustainable public enrolment", "start and sustainable public environment"
"Smart and sustainable food environment" » "Smart and sustainable forest environment", "Smart and sustainable _ environment", "Smart and sustainable food environmental", "Smart and sustainable road environment", "Smart and sustainable cloud environment"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("smart and sustainable public environment") or ("Smart and sustainable food environment"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("smart and sustainable public environment") OR ("Smart and sustainable food environment")).
• Removing quotes may allow a broader search: (( smart and sustainable public environment ) or ( Smart and sustainable food environment )).
• Adding a wildcard symbol may retrieve word variants: (("smart and sustainable public environment") or ("Smart and sustainable food environment"))*.