Perhaps you should try some spelling variations:
"a development studies." » "a development services.", "a development strategies.", "a development strategy."
"clean development studies." » "clean development services.", "clean development strategies.", "clean development strategy.", "human development studies.", "urban development studies."
"clean development series." » "clean development services.", "clean development agencies.", "clean development strategies.", "human development series.", "urban 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: (("a development studies.") or ((("clean development studies.") OR ("clean development series."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a development studies.") OR ((("clean development studies.") OR ("clean development series.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"a development studies.\") or (((\"clean development studies.\") OR (\"clean development series.\"))))".
• Removing quotes may allow a broader search: (( a development studies. ) or ((( clean development studies. ) OR ( clean development series. )))).
• Adding a wildcard symbol may retrieve word variants: (("a development studies.") or ((("clean development studies.") OR ("clean development series."))))*.