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

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