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 series." » "clean development services.", "clean development agencies.", "clean development strategies.", "human development series.", "urban development series.", "child development series."
"clean development africa." » "human development africa.", "urban development africa.", "child development africa."

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