Perhaps you should try some spelling variations:
"commutative arens" » "commutative rings", "commutative crepant", "commutative kernels"
"commutative ring" » "commutative rings"
"commutative rngs" » "commutative rings", "commutative bands", "commutative rough"

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: (("commutative ring") OR ((("commutative rngs") OR ("commutative arens")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"commutative ring\") or (((\"commutative rngs\") OR (\"commutative arens\"))))".
• Removing quotes may allow a broader search: (( commutative ring ) or ((( commutative rngs ) OR ( commutative arens )))).
• Adding a wildcard symbol may retrieve word variants: (("commutative ring") or ((("commutative rngs") OR ("commutative arens"))))*.