Perhaps you should try some spelling variations:
"varela el psicoanalisis la epigenetica." » "varela el psicoanalisis a epigenetica.", "varela el psicoanalisis una epigenetica.", "varela el psicoanalisis en epigenetica.", "varela el psicoanalisis la genetica.", "varela del psicoanalisis la epigenetica.", "varela en psicoanalisis la epigenetica.", "varelo el psicoanalisis la epigenetica."
"sarduy el psicoanalisis y epigenetica." » "sarduy el psicoanalisis y genetica.", "sarduy y psicoanalisis y epigenetica.", "sarduy la psicoanalisis y epigenetica.", "sarda el psicoanalisis y epigenetica."

Try widening your search to All Fields.

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