Perhaps you should try some spelling variations:
"classical mechanisms" » "classical mechanics", "classical mechanistic", "classical mechanical", "classical mechanicss", "classical mechanistics", "classical mechanicals"
"classical mechanism" » "classical mechanics", "classical mechanistic", "classical mechanical"
"physical mechanical" » "physical mechanisms", "chemical mechanical"
"physico mechanical" » "physico chemical", "hydro mechanical"

Try widening your search to All Fields.

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 mechanism") OR ((("physical mechanical") OR ("physico mechanical"))))) OR ("classical mechanisms")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"classical mechanism\") or (((\"physical mechanical\") OR (\"physico mechanical\"))))) or (\"classical mechanisms\"))".
• Removing quotes may allow a broader search: (((( classical mechanism ) or ((( physical mechanical ) OR ( physico mechanical ))))) or ( classical mechanisms )).
• Adding a wildcard symbol may retrieve word variants: (((("classical mechanism") or ((("physical mechanical") OR ("physico mechanical"))))) or ("classical mechanisms"))*.