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