Perhaps you should try some spelling variations:
"a development studies." » "a development services.", "a development strategies.", "a development strategy."
"child development studies." » "child development services.", "child development strategies.", "child development strategy.", "world development studies."
"clean development series." » "clean development services.", "clean development agencies.", "clean development strategies.", "human development series.", "urban 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 ((("child development studies.") or ("clean development series."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a development studies.") OR ((("child development studies.") OR ("clean development series.")))).
• Removing quotes may allow a broader search: (( a development studies. ) or ((( child development studies. ) or ( clean development series. )))).
• Adding a wildcard symbol may retrieve word variants: (("a development studies.") or ((("child development studies.") or ("clean development series."))))*.