Perhaps you should try some spelling variations:
"comicas matematicas computer programas." » "comicas mathematics computer programas.", "comicas matematicas como programas.", "comicas matematicas comics programas.", "ciencias matematicas computer programas.", "logica matematica computer programas.", "economicos matematicos computer programas.", "comicas matematicas computer programs.", "comicas matematicas computer program.", "comicas matematicas computer programmers."
"basicas matematicas control programming." » "benditas matematicas control programming.", "fisica matematica control programming.", "fisico matematicas control programming.", "basicas matematicas con programming.", "basicas matematicas como programming.", "basicas matematicas entre 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: (("basicas matematicas control programming.") or ("comicas matematicas computer programas."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("basicas matematicas control programming.") OR ("comicas matematicas computer programas.")).
• Removing quotes may allow a broader search: (( basicas matematicas control programming. ) or ( comicas matematicas computer programas. )).
• Adding a wildcard symbol may retrieve word variants: (("basicas matematicas control programming.") or ("comicas matematicas computer programas."))*.