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

Try widening your search to All Fields.

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