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

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