Perhaps you should try some spelling variations:
"comicas matematicas computer programming." » "comicas mathematics computer programming.", "comicas matematicas como programming.", "comicas matematicas comics programming.", "comicas matematicas computer programs.", "comicas matematicas computer program.", "basicas matematicas computer programming.", "ciencias matematicas computer programming.", "economicos matematicos computer programming."
"logica matematica computer programas." » "logica mathematics computer programas.", "logica matematica computer programs.", "logica matematica computer program.", "logica matematica computer programmers.", "fisica matematica computer programas.", "la matematica computer programas."

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: (("logica matematica computer programas.") or ("comicas matematicas computer programming."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("logica matematica computer programas.") OR ("comicas matematicas computer programming.")).
• Removing quotes may allow a broader search: (( logica matematica computer programas. ) or ( comicas matematicas computer programming. )).
• Adding a wildcard symbol may retrieve word variants: (("logica matematica computer programas.") or ("comicas matematicas computer programming."))*.