Perhaps you should try some spelling variations:
"a development process." » "a development projects.", "a development programs.", "a development policies."
"clean development process." » "clean development projects.", "clean development programs.", "clean development policies.", "human development process.", "urban development process."
"a development series." » "a development services.", "a development agencies.", "a development strategies."

Try widening your search to All Fields.

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