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."
"a development studies." » "a development series.", "a development strategies.", "a development strategy.", "_ development studies.", "asian development studies.", "city development studies."
"clean development studies." » "clean development series.", "clean development strategies.", "clean development strategy.", "human development studies.", "urban development studies.", "child development studies."

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 studies.") OR ("a development services."))) or ("clean development studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a development studies.") OR ("a development services."))) OR ("clean development studies.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a development studies.\") OR (\"a development services.\"))) or (\"clean development studies.\"))".
• Removing quotes may allow a broader search: (((( a development studies. ) OR ( a development services. ))) or ( clean development studies. )).
• Adding a wildcard symbol may retrieve word variants: (((("a development studies.") OR ("a development services."))) or ("clean development studies."))*.