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