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."
"_ development series." » "_ development services.", "_ development agencies.", "_ development strategies."
"a development series." » "a development services.", "a development agencies.", "a development strategies."

Try widening your search to All Fields.

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