Perhaps you should try some spelling variations:
"clean development series." » "clean development services.", "clean development agencies.", "clean development africa.", "human development series.", "urban development series."
"child development series." » "child development services.", "child development agencies.", "child development africa.", "world development series."
"a development policy." » "_ development policy.", "asian development policy.", "city development policy."

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