Perhaps you should try some spelling variations:
"symmetry groupss" » "symmetry groups", "symmetry grouping", "symmetric groups", "symmetry groupsss", "symmetric groupsss"
"symmetric group" » "symmetry groups"
"symmetry group" » "symmetry groups", "symmetric groups"

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: (((("symmetry group") OR ("symmetric group"))) OR ("symmetry groupss")).
• Removing quotes may allow a broader search: (((( symmetry group ) or ( symmetric group ))) or ( symmetry groupss )).
• Adding a wildcard symbol may retrieve word variants: (((("symmetry group") or ("symmetric group"))) or ("symmetry groupss"))*.