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