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

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