Perhaps you should try some spelling variations:
"teorias generales" » "teoria general", "normas generales", "obras generales"
"leyes generales" » "leyes general", "leyes federales", "planes generales"
"theater general" » "teatro general", "caracter general"
"themes 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: (((("teorias generales") or ("leyes generales"))) or ((("themes general") OR ("theater general"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("teorias generales") OR ("leyes generales"))) OR ((("themes general") OR ("theater general")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"teorias generales\") or (\"leyes generales\"))) or (((\"themes general\") OR (\"theater general\"))))".
• Removing quotes may allow a broader search: (((( teorias generales ) or ( leyes generales ))) or ((( themes general ) OR ( theater general )))).
• Adding a wildcard symbol may retrieve word variants: (((("teorias generales") or ("leyes generales"))) or ((("themes general") OR ("theater general"))))*.