Perhaps you should try some spelling variations:
"serie lacteas la clase." » "serie lecturas la clase.", "serie letras la clase.", "serie lacteos la clase.", "serie lacteos las clase.", "serie lacteas y clase."
"serie detras de clacso." » "serie letras de clacso.", "serie lecturas de clacso.", "serie retratos de clacso."
"serie actas la clase." » "serie letras la clase.", "serie fichas la clase.", "serie actis la clase.", "serie actos la clase.", "serie actas de clase."

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: (((("serie actas la clase.") OR ("serie lacteas la clase."))) OR ("serie detras de clacso."))~.
• Removing quotes may allow a broader search: (((( serie actas la clase. ) or ( serie lacteas la clase. ))) or ( serie detras de clacso. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("serie actas la clase.") or ("serie lacteas la clase."))) or ("serie detras de clacso."))*.