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 studies." » "_ development services.", "_ development strategies.", "_ development strategy."
"mine development series." » "mine development services.", "mine development agencies.", "mine development strategies.", "sme development series.", "trade development series.", "business 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 ("mine development series."))) or ("_ development studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("mine development studies.") OR ("mine development series."))) OR ("_ development studies.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"mine development studies.\") OR (\"mine development series.\"))) or (\"_ development studies.\"))".
• Removing quotes may allow a broader search: (((( mine development studies. ) OR ( mine development series. ))) or ( _ development studies. )).
• Adding a wildcard symbol may retrieve word variants: (((("mine development studies.") OR ("mine development series."))) or ("_ development studies."))*.