Perhaps you should try some spelling variations:
"sub specie aeternitatis" » "sub speci aeternitatis", "sub specic aeternitatis", "sub specimen aeternitatis"
"sub species aeternitatis" » "sub specis aeternitatis", "sub specics aeternitatis", "sub specimens aeternitatis"
"sub specis aeternitatis" » "sub speci aeternitatis", "sub specic aeternitatis", "sub speciosa 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 specis aeternitatis") OR ("sub species aeternitatis"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("sub specie aeternitatis") OR ((("sub specis aeternitatis") OR ("sub species aeternitatis")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sub specie aeternitatis\") or (((\"sub specis aeternitatis\") OR (\"sub species aeternitatis\"))))".
• Removing quotes may allow a broader search: (( sub specie aeternitatis ) or ((( sub specis aeternitatis ) OR ( sub species aeternitatis )))).
• Adding a wildcard symbol may retrieve word variants: (("sub specie aeternitatis") or ((("sub specis aeternitatis") OR ("sub species aeternitatis"))))*.