Perhaps you should try some spelling variations:
"mine development services." » "mine development process.", "sme development services.", "trade development services.", "business development services."
"_ development studies." » "_ development strategies.", "_ development strategy.", "_ development policies."
"city development series." » "city development agencies.", "city development strategies.", "city development strategy.", "capacity development series.", "policy development series.", "community development series."

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