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

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