Perhaps you should try some spelling variations:
"mathematical methodsing" » "mathematical methodology", "mathematical method", "mathematica methoden", "mathematical modelsing"
"mathematical modeling" » "mathematical models", "mathematical modelsing"
"mathematical methods" » "mathematical models"
"mathematical model" » "mathematical models"

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