Perhaps you should try some spelling variations:
"clean development series." » "clean development services.", "clean development agencies.", "clean development strategies.", "human development series.", "urban development series.", "child development series."
"city development africa." » "child development africa.", "capacity development africa.", "capital development africa."
"a development africa." » "_ development africa.", "asian 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: (("clean development series.") or ((("a development africa.") OR ("city development africa."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("clean development series.") OR ((("a development africa.") OR ("city development africa.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"clean development series.\") or (((\"a development africa.\") OR (\"city development africa.\"))))".
• Removing quotes may allow a broader search: (( clean development series. ) or ((( a development africa. ) OR ( city development africa. )))).
• Adding a wildcard symbol may retrieve word variants: (("clean development series.") or ((("a development africa.") OR ("city development africa."))))*.