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

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