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