Perhaps you should try some spelling variations:
"clean development projects." » "clean development policy.", "human development projects.", "urban development projects.", "child development projects."
"_ development studies." » "_ development series.", "_ development services.", "_ development strategies."
"e development strategy." » "a development strategy.", "sme development strategy.", "mine development strategy."

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

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