Perhaps you should try some spelling variations:
"interdisciplinary approach mathematics" » "multidisciplinary approach mathematics", "interdisciplinary approaches mathematics", "interdisciplinary approaches mathematical", "interdisciplinary applied mathematics"
"interdisciplinary approach mathematical" » "multidisciplinary approach mathematical", "interdisciplinary approaches mathematical", "interdisciplinary through mathematical", "interdisciplinary approach theoretical"
"interdisciplinary appendix mathematical" » "interdisciplinarity appendix mathematical", "interdisciplinary aspects mathematical", "interdisciplinary gender mathematical"
"interdisciplinary applied mathematical" » "interdisciplinary analyses mathematical", "interdisciplinary aspects mathematical", "interdisciplinary area mathematical", "interdisciplinary applied mathematics", "interdisciplinary advanced mathematical", "interdisciplinary based mathematical"

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: (("interdisciplinary approach mathematics") OR ((("interdisciplinary approach mathematical") OR ((("interdisciplinary applied mathematical") OR ("interdisciplinary appendix mathematical"))))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"interdisciplinary approach mathematics\") or (((\"interdisciplinary approach mathematical\") or (((\"interdisciplinary applied mathematical\") OR (\"interdisciplinary appendix mathematical\"))))))*".
• Removing quotes may allow a broader search: (( interdisciplinary approach mathematics ) or ((( interdisciplinary approach mathematical ) or ((( interdisciplinary applied mathematical ) OR ( interdisciplinary appendix mathematical ))))))*.