Perhaps you should try some spelling variations:
"perez y psicoanalisis la genetica." » "perez y psicoanalisis a genetica.", "perez y psicoanalisis una genetica.", "perez y psicoanalisis y genetica.", "perez a psicoanalisis la genetica."
"varela el psicoanalisis 9 epigenesia." » "varela el psicoanalisis y epigenesia.", "varela el psicoanalisis a epigenesia.", "varela el psicoanalisis en epigenesia.", "varela el psicoanalisis y epigenetica.", "varela el psicoanalisis y eugenesia.", "varela del psicoanalisis 9 epigenesia.", "varela en psicoanalisis 9 epigenesia.", "varelo el psicoanalisis 9 epigenesia."

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: (("perez y psicoanalisis la genetica.") OR ("varela el psicoanalisis 9 epigenesia."))~.
• Removing quotes may allow a broader search: (( perez y psicoanalisis la genetica. ) or ( varela el psicoanalisis 9 epigenesia. ))~.
• Adding a wildcard symbol may retrieve word variants: (("perez y psicoanalisis la genetica.") or ("varela el psicoanalisis 9 epigenesia."))*.