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 use environment" » "smart and sustainable use environmental", "smart and sustainable safe environment", "smart and sustainable home environment", "start and sustainable use environment"

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