Perhaps you should try some spelling variations:
"urea y psicoanalisis al epigenetica." » "urea y psicoanalisis a epigenetica.", "urea y psicoanalisis el epigenetica.", "urea y psicoanalisis del epigenetica.", "urea y psicoanalisis la epigenetica.", "urea y psicoanalisis y epigenetico.", "urea y psicoanalisis clave epigenetica."
"varela el psicoanalisis y epigenetica." » "varela el psicoanalisis la epigenetica.", "varela el psicoanalisis y genetica.", "varela del psicoanalisis y epigenetica.", "varela en psicoanalisis y epigenetica.", "varelo el psicoanalisis y epigenetica."

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: (("varela el psicoanalisis y epigenetica.") or ("urea y psicoanalisis al epigenetica."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("varela el psicoanalisis y epigenetica.") OR ("urea y psicoanalisis al epigenetica.")).
• Removing quotes may allow a broader search: (( varela el psicoanalisis y epigenetica. ) or ( urea y psicoanalisis al epigenetica. )).
• Adding a wildcard symbol may retrieve word variants: (("varela el psicoanalisis y epigenetica.") or ("urea y psicoanalisis al epigenetica."))*.