Perhaps you should try some spelling variations:
"sub speci aeternitatis" » "sub specic aeternitatis", "sub spei aeternitatis", "sub peci aeternitatis", "sub spedi aeternitatis"
"sub spec aeternitatis" » "sub spe aeternitatis", "sub pec aeternitatis", "sub sped aeternitatis"
"sub speck aeternitatis" » "sub spek aeternitatis", "sub peck aeternitatis", "sub spedk aeternitatis", "sub speak aeternitatis", "sub speek 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 speci aeternitatis") or ((("sub spec aeternitatis") OR ("sub speck aeternitatis"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("sub speci aeternitatis") OR ((("sub spec aeternitatis") OR ("sub speck aeternitatis")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sub speci aeternitatis\") or (((\"sub spec aeternitatis\") OR (\"sub speck aeternitatis\"))))".
• Removing quotes may allow a broader search: (( sub speci aeternitatis ) or ((( sub spec aeternitatis ) OR ( sub speck aeternitatis )))).
• Adding a wildcard symbol may retrieve word variants: (("sub speci aeternitatis") or ((("sub spec aeternitatis") OR ("sub speck aeternitatis"))))*.