Perhaps you should try some spelling variations:
"clean development strategies." » "clean development strategy.", "human development strategies.", "urban development strategies."
"a development studies." » "a development series.", "a development services.", "a development strategy."
"a development process." » "a development projects.", "a development programs.", "a development policies."

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