Perhaps you should try some spelling variations:
"eines and mineral resources" » "eines and natural resources", "eine and mineral resources", "einen and mineral resources"
"einer and mineral resources" » "einer and natural resources", "eine and mineral resources"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"eines and mineral resources\") OR (\"einer and mineral resources\"))".
• Removing quotes may allow a broader search: (( eines and mineral resources ) OR ( einer and mineral resources )).
• Adding a wildcard symbol may retrieve word variants: (("eines and mineral resources") OR ("einer and mineral resources"))*.