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

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: (("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."))))*.