Perhaps you should try some spelling variations:
del curso » el curso (Expand Search), del cuerpo (Expand Search), do curso (Expand Search)
anejos » anejo (Expand Search)
xxiii » xiii (Expand Search), xviii (Expand Search), xxii (Expand Search)
xvii » xviii (Expand Search), xiii (Expand Search), xvi (Expand Search)
xxviiiii » xxviiiiii (Expand Search), xxiiiiii (Expand Search), xxviiii (Expand Search)
xxviiiiii » xxviiiiiii (Expand Search), xxiiiiiii (Expand Search), xxviiiii (Expand Search)
vii » viii (Expand Search)

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

• If you are trying to use Boolean operators, they must be ALL CAPS: anejos del curso ((xxiii OR (xvii OR ((xxviiiii OR xxviiiii) OR xxviiiiii))) OR vii)~.
• Adding a wildcard symbol may retrieve word variants: anejos del curso ((xxiii or (xvii or ((xxviiiii or xxviiiii) or xxviiiiii))) or vii)*.