Perhaps you should try some spelling variations:
"clean development studies." » "clean development series.", "clean development services.", "clean development strategies.", "human development studies.", "urban development studies.", "child development studies."
"_ development studies." » "_ development series.", "_ development services.", "_ development strategies."
"clean development africa." » "human development africa.", "urban development africa.", "child development africa."

Try widening your search to All Fields.

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

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