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

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