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

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 ((((("symmetry groups") OR ("symmetric groupss"))) OR ("symmetric groupss")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"symmetry group\") or (((((\"symmetry groups\") OR (\"symmetric groupss\"))) or (\"symmetric groupss\"))))".
• Removing quotes may allow a broader search: (( symmetry group ) or ((((( symmetry groups ) OR ( symmetric groupss ))) or ( symmetric groupss )))).
• Adding a wildcard symbol may retrieve word variants: (("symmetry group") or ((((("symmetry groups") OR ("symmetric groupss"))) or ("symmetric groupss"))))*.