Perhaps you should try some spelling variations:
"a development research" » "a development report", "_ development research", "clean development research", "city development research"
"a development reports" » "a development report", "a development efforts", "a development regional", "_ development reports", "clean development reports", "city development reports"
"asian development results" » "asian development report", "human development results", "urban development results", "clean development results"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("a development reports") OR ("a development research"))) or ("asian development results"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("a development reports") OR ("a development research"))) or ("asian development results"))*.