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