Perhaps you should try some spelling variations:
"apuntes generales" » "aspectos generales", "asientos generales", "manuales generales"
"temas generales" » "temas centrales", "teorias generales", "normas generales", "leyes generales", "games generales"
"themes general" » "theater general", "leyes general", "games general"
"temas general" » "leyes general", "games general"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("temas generales") or ("apuntes generales"))) or ((("temas general") or ("themes general"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("temas generales") OR ("apuntes generales"))) OR ((("temas general") OR ("themes general")))).
• Removing quotes may allow a broader search: (((( temas generales ) or ( apuntes generales ))) or ((( temas general ) or ( themes general )))).
• Adding a wildcard symbol may retrieve word variants: (((("temas generales") or ("apuntes generales"))) or ((("temas general") or ("themes general"))))*.