Perhaps you should try some spelling variations:
"city development studies." » "city development services.", "city development strategies.", "city development strategy.", "child development studies.", "capacity development studies.", "capital development studies."
"clean development studies." » "clean development services.", "clean development strategies.", "clean development strategy.", "human development studies.", "urban development studies.", "child development studies."
"_ development series." » "_ development services.", "_ development agencies.", "_ development africa."

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 studies.") or ("_ development series."))) or ("clean development studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("city development studies.") OR ("_ development series."))) OR ("clean development studies.")).
• Removing quotes may allow a broader search: (((( city development studies. ) or ( _ development series. ))) or ( clean development studies. )).
• Adding a wildcard symbol may retrieve word variants: (((("city development studies.") or ("_ development series."))) or ("clean development studies."))*.