Perhaps you should try some spelling variations:
"sub specie aeternitatis" » "sub species aeternitatis", "sub speci aeternitatis", "sub specic aeternitatis"
"sub specics aeternitatis" » "sub species aeternitatis", "sub specic aeternitatis", "sub specifics aeternitatis"
"sub specis aeternitatis" » "sub species aeternitatis", "sub speci aeternitatis", "sub specic aeternitatis"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("sub specie aeternitatis") or ((("sub specics aeternitatis") or ("sub specis aeternitatis"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("sub specie aeternitatis") OR ((("sub specics aeternitatis") OR ("sub specis aeternitatis")))).
• Removing quotes may allow a broader search: (( sub specie aeternitatis ) or ((( sub specics aeternitatis ) or ( sub specis aeternitatis )))).
• Adding a wildcard symbol may retrieve word variants: (("sub specie aeternitatis") or ((("sub specics aeternitatis") or ("sub specis aeternitatis"))))*.