Perhaps you should try some spelling variations:
"a development services." » "a development agencies.", "a development process.", "_ development services.", "clean development services.", "asian development services."
"urban development africa." » "human development africa."
"a development strategy." » "_ development strategy.", "clean development strategy.", "asian development strategy."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("a development services.") or ((("a development strategy.") or ("urban development africa."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a development services.") OR ((("a development strategy.") OR ("urban development africa.")))).
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• Adding a wildcard symbol may retrieve word variants: (("a development services.") or ((("a development strategy.") or ("urban development africa."))))*.