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

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