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 public enrolment", "smart and sustainable built environment", "smart and sustainable policies environment", "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"

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