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

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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