Perhaps you should try some spelling variations:
"mine development studies." » "mine development services.", "mine development strategies.", "mine development strategy.", "sme development studies.", "trade development studies.", "business development studies."
"a development studies." » "a development services.", "a development strategies.", "a development strategy."
"_ development series." » "_ development services.", "_ development agencies.", "_ development strategies."

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