Perhaps you should try some spelling variations:
"quantum dynamical system" » "quantum dynamics system", "quantum chemical system", "quantum dynamic systems"
"random dynamical system" » "random dynamic systems"
"random dynamical systems" » "random dynamic systemss"

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