Perhaps you should try some spelling variations:
"ciencias mathematics computer programmers." » "ciencias matematicas computer programmers.", "sciences mathematics computer programmers.", "financial mathematics computer programmers.", "ciencias mathematics computer programs.", "ciencias mathematics computer programming.", "ciencias mathematics computers programming."
"basicas matematicas con programas." » "comicas matematicas con programas.", "benditas matematicas con programas.", "fisica matematica con programas.", "basicas matematicas en programas.", "basicas matematica en programas.", "basicas matematicas y programas.", "basicas matematicas con programa.", "basicas matematicas los programas."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("ciencias mathematics computer programmers.") or ("basicas matematicas con programas."))~.
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• Adding a wildcard symbol may retrieve word variants: (("ciencias mathematics computer programmers.") or ("basicas matematicas con programas."))*.