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

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