Perhaps you should try some spelling variations:
"quantum dynamical system" » "quantum dynamics system", "quantum chemical system", "quantum dynamical systems", "quantum dynamic systems"
"random dynamic systemss" » "random dynamic systems", "random dynamic system", "random dynamics systems", "random dynamics systemss", "random dynamical systemss", "freedom 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 dynamic systemss") OR ("quantum dynamical system")).
• Removing quotes may allow a broader search: (( random dynamic systemss ) or ( quantum dynamical system )).
• Adding a wildcard symbol may retrieve word variants: (("random dynamic systemss") or ("quantum dynamical system"))*.