Perhaps you should try some spelling variations:
"basicas mathematics computer programa." » "basicas matematicas computer programa.", "business mathematics computer programa.", "basicas mathematics computer programs.", "basicas mathematics computer program.", "basicas mathematics computer programming."
"comicas matematicas logic programming." » "basicas matematicas logic programming.", "ciencias matematicas logic programming.", "logica matematica logic programming.", "comicas matematica logica programming.", "comicas mathematics logic programming.", "comicas matematicas comics programming."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("basicas mathematics computer programa.") OR ("comicas matematicas logic programming.")).
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• Adding a wildcard symbol may retrieve word variants: (("basicas mathematics computer programa.") or ("comicas matematicas logic programming."))*.