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

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