Perhaps you should try some spelling variations:
"smart and sustainable public enrolment" » "smart and sustainable policy enrolment", "smart and sustainable built enrolment", "smart and sustainable policies enrolment", "smart and sustainable public involvement", "smart and sustainable public enforcement", "smart and sustainable public employment", "start and sustainable public enrolment"
"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 use environment") or ("smart and sustainable public enrolment"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("smart and sustainable use environment") OR ("smart and sustainable public enrolment")).
• Removing quotes may allow a broader search: (( smart and sustainable use environment ) or ( smart and sustainable public enrolment )).
• Adding a wildcard symbol may retrieve word variants: (("smart and sustainable use environment") or ("smart and sustainable public enrolment"))*.