Perhaps you should try some spelling variations:
"dynamischen systems" » "dynamischen systemen", "dynamischer systeme", "dynamische systeme"
"dynamical system" » "dynamical systems"
"economic systems" » "economic sectors"
"dynamic systems" » "dynamical systems", "dynamical systemss"
"dynamic system" » "dynamical systems"

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: (((("dynamischen systems") OR ((("dynamic system") OR ("dynamical system"))))) OR ((("dynamic systems") OR ("economic systems")))).
• Removing quotes may allow a broader search: (((( dynamischen systems ) or ((( dynamic system ) or ( dynamical system ))))) or ((( dynamic systems ) or ( economic systems )))).
• Adding a wildcard symbol may retrieve word variants: (((("dynamischen systems") or ((("dynamic system") or ("dynamical system"))))) or ((("dynamic systems") or ("economic systems"))))*.