Perhaps you should try some spelling variations:
"mathematical geophysics" » "mathematical physics", "mathematics physics", "mathematical physical"
"mathematical topics" » "mathematical theories", "mathematical physics", "mathematical tables"
"mathematical tools" » "mathematical theory"

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: (("mathematical geophysics") OR ((("mathematical topics") OR ("mathematical tools")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mathematical geophysics\") or (((\"mathematical topics\") OR (\"mathematical tools\"))))".
• Removing quotes may allow a broader search: (( mathematical geophysics ) or ((( mathematical topics ) OR ( mathematical tools )))).
• Adding a wildcard symbol may retrieve word variants: (("mathematical geophysics") or ((("mathematical topics") OR ("mathematical tools"))))*.