Perhaps you should try some spelling variations:
"mine development studies." » "mine development series.", "mine development services.", "mine development strategies.", "sme development studies.", "trade development studies.", "based development studies."
"asian development studies." » "asian development series.", "asian development services.", "asian development strategies.", "human development studies.", "urban development studies.", "clean development studies."
"_ development studies." » "_ development series.", "_ development services.", "_ 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: (((("mine development studies.") or ("asian development studies."))) or ("_ development studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("mine development studies.") OR ("asian development studies."))) OR ("_ development studies.")).
• Removing quotes may allow a broader search: (((( mine development studies. ) or ( asian development studies. ))) or ( _ development studies. )).
• Adding a wildcard symbol may retrieve word variants: (((("mine development studies.") or ("asian development studies."))) or ("_ development studies."))*.