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

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 ((((((((("dynamics systems") OR ("dynamischen systems"))) OR ("dynamisches system"))) OR ((("dynamic systems") OR ("economic systems"))))) OR ((("dynamics system") OR ("dynamical system")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"dynamical systems\") or (((((((((\"dynamics systems\") or (\"dynamischen systems\"))) or (\"dynamisches system\"))) or (((\"dynamic systems\") OR (\"economic systems\"))))) or (((\"dynamics system\") or (\"dynamical system\"))))))".
• Removing quotes may allow a broader search: (( dynamical systems ) or ((((((((( dynamics systems ) or ( dynamischen systems ))) or ( dynamisches system ))) or ((( dynamic systems ) OR ( economic systems ))))) or ((( dynamics system ) or ( dynamical system )))))).
• Adding a wildcard symbol may retrieve word variants: (("dynamical systems") or ((((((((("dynamics systems") or ("dynamischen systems"))) or ("dynamisches system"))) or ((("dynamic systems") OR ("economic systems"))))) or ((("dynamics system") or ("dynamical system"))))))*.