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