Perhaps you should try some spelling variations:
"dynamischen systems" » "dynamischen systemen", "dynamischer systeme", "dynamische systeme"
"dynamisches systems" » "dynamisches system", "dynamischer systeme", "dynamische systeme"
"economic systems" » "economic sectors"
"dynamics system" » "dynamic system", "dynamical system", "dynamic systems"
"dynamical systems" » "dynamic 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: (("dynamical systems") OR ((((("dynamischen systems") OR ("dynamisches systems"))) OR ((("dynamics system") OR ("economic systems")))))).
• Removing quotes may allow a broader search: (( dynamical systems ) or ((((( dynamischen systems ) or ( dynamisches systems ))) or ((( dynamics system ) or ( economic systems )))))).
• Adding a wildcard symbol may retrieve word variants: (("dynamical systems") or ((((("dynamischen systems") or ("dynamisches systems"))) or ((("dynamics system") or ("economic systems"))))))*.