Perhaps you should try some spelling variations:
"Smart and sustainable public environment" » "Smart and sustainable public environmental", "Smart and sustainable policy environment", "Smart and sustainable republic environmental", "Smart and sustainable solid environment", "Smart and sustainable mobility environment"
"Smart and sustainable public enrolment" » "Smart and sustainable policy enrolment", "Smart and sustainable solid enrolment", "Smart and sustainable mobility enrolment", "Smart and sustainable public involvement", "Smart and sustainable public enforcement", "Smart and sustainable public employment"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("Smart and sustainable public environment") OR ("Smart and sustainable public enrolment"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Smart and sustainable public environment\") OR (\"Smart and sustainable public enrolment\"))".
• Removing quotes may allow a broader search: (( Smart and sustainable public environment ) OR ( Smart and sustainable public enrolment )).
• Adding a wildcard symbol may retrieve word variants: (("Smart and sustainable public environment") OR ("Smart and sustainable public enrolment"))*.