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