Perhaps you should try some spelling variations:
"asian development policy." » "human development policy.", "urban development policy.", "capital development policy."
"clean development policy." » "human development policy.", "urban development policy.", "child development policy."
"a development policy." » "_ development policy.", "city development policy."

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