Perhaps you should try some spelling variations:
"clean development studies." » "clean development series.", "clean development strategies.", "clean development strategy.", "human development studies.", "urban development studies."
"_ development process." » "_ development projects.", "_ development programs.", "_ development policies."
"e development services." » "sme development services.", "mine development services.", "site development services."

Try widening your search to All Fields.

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