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