Perhaps you should try some spelling variations:
"interdisciplinary issues mathematics" » "interdisciplinary dialogues mathematics", "interdisciplinary discourse mathematics", "interdisciplinary insights mathematics", "interdisciplinary issues mathematical", "interdisciplinary values mathematics", "interdisciplinary images mathematics"
"interdisciplinary analysis mathematik" » "interdisciplinary analysis mathematics", "interdisciplinary analysis mathematical", "interdisciplinary analysis mathematische"

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 analysis mathematik") OR ("interdisciplinary issues mathematics"))*.
• Removing quotes may allow a broader search: (( interdisciplinary analysis mathematik ) or ( interdisciplinary issues mathematics ))*.