Perhaps you should try some spelling variations:
"classical mechanisms" » "classical mechanism", "classical mechanistic", "classical mechanical"
"classical mechanics" » "classical mechanical"
"statistical methods" » "statistics methods"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("classical mechanisms") OR ("classical mechanics"))) OR ("statistical methods")).
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• Removing quotes may allow a broader search: (((( classical mechanisms ) OR ( classical mechanics ))) or ( statistical methods )).
• Adding a wildcard symbol may retrieve word variants: (((("classical mechanisms") OR ("classical mechanics"))) or ("statistical methods"))*.