Perhaps you should try some spelling variations:
"der regional economics conditions." » "der regional economic conditions.", "der regional economic condition.", "der regional economic conditons.", "der regionale economics conditions.", "per regional economics conditions.", "der regionalen economics conditions."
"durch regionale economic conditiond." » "durch regionale economic conditions.", "durch regionale economic condition.", "durch regionale economic conditons.", "durch regional economic conditiond.", "durch regionalism economic conditiond.", "durch regional economy conditiond.", "der regionale economic conditiond."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("der regional economics conditions.") or ("durch regionale economic conditiond."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("der regional economics conditions.") OR ("durch regionale economic conditiond.")).
• Removing quotes may allow a broader search: (( der regional economics conditions. ) or ( durch regionale economic conditiond. )).
• Adding a wildcard symbol may retrieve word variants: (("der regional economics conditions.") or ("durch regionale economic conditiond."))*.