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

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