Perhaps you should try some spelling variations:
"_ development studies." » "_ development services.", "_ development strategies.", "_ development strategy."
"clean development studies." » "clean development services.", "clean development strategies.", "clean development strategy.", "urban development studies."
"human development series." » "human development services.", "human development agencies.", "human development strategies."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("_ development studies.") or ((("clean development studies.") or ("human development series."))))~.
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• Adding a wildcard symbol may retrieve word variants: (("_ development studies.") or ((("clean development studies.") or ("human development series."))))*.