Perhaps you should try some spelling variations:
mathematical geosciences » mathematical sciences, mathematical science, mathematics science
appendix mathematische » appendix mathematics, appendix mathmatical, anwendung mathematische
mathematische spiele » mathematische symbole, mathematische sprache, mathematische zeichen

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( appendix mathematical geosciences ) OR ( appendix mathematische spiele )).
• Adding a wildcard symbol may retrieve word variants: (( appendix mathematical geosciences ) or ( appendix mathematische spiele ))*.