Perhaps you should try some spelling variations:
"physical mechanisms" » "physiological mechanisms"
"classical mechanism" » "classical mechanisms", "classical mechanistic", "classical mechanical"
"classical mechanics" » "classical mechanical"

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: (("classical mechanics") OR ((("physical mechanisms") OR ("classical mechanism")))).
• Removing quotes may allow a broader search: (( classical mechanics ) or ((( physical mechanisms ) or ( classical mechanism )))).
• Adding a wildcard symbol may retrieve word variants: (("classical mechanics") or ((("physical mechanisms") or ("classical mechanism"))))*.