Perhaps you should try some spelling variations:
"teorias generales" » "normas generales", "obras generales", "cortes generales"
"temas generales" » "temas centrales", "normas generales", "reglas generales", "themes generales", "leyes generales", "games generales"
"teoria general" » "tierra general", "historia general"
"temas general" » "themes general", "leyes general", "games general"

Try widening your search to All Fields.

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 ((("teorias generales") OR ("teoria general"))))) or ("temas general"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("temas generales") OR ((("teorias generales") OR ("teoria general"))))) OR ("temas general")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"temas generales\") or (((\"teorias generales\") OR (\"teoria general\"))))) or (\"temas general\"))".
• Removing quotes may allow a broader search: (((( temas generales ) or ((( teorias generales ) OR ( teoria general ))))) or ( temas general )).
• Adding a wildcard symbol may retrieve word variants: (((("temas generales") or ((("teorias generales") OR ("teoria general"))))) or ("temas general"))*.