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