Perhaps you should try some spelling variations:
"quantum dynamical system" » "quantum chemical system", "quantum dynamical systems", "quantum dynamic systems"
"random dynamical system" » "random dynamical systems", "random dynamic systems"
"quantum dynamics system" » "quantum dynamic system", "quantum dynamic systems", "quantum dynamisches 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: (("random dynamical system") OR ((("quantum dynamical system") OR ("quantum dynamics system")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"random dynamical system\") or (((\"quantum dynamical system\") OR (\"quantum dynamics system\"))))".
• Removing quotes may allow a broader search: (( random dynamical system ) or ((( quantum dynamical system ) OR ( quantum dynamics system )))).
• Adding a wildcard symbol may retrieve word variants: (("random dynamical system") or ((("quantum dynamical system") OR ("quantum dynamics system"))))*.