Perhaps you should try some spelling variations:
"copulas mathematical computer programmers." » "copulas mathematics computer programmers.", "computers mathematical computer programmers.", "costs mathematical computer programmers.", "comicas matematicas computer programmers.", "copulas mathematical computer programs.", "copulas mathematical computer programming.", "copulas mathematical computers programming."
"basicas matematica tomo programas." » "basicas matematicas tomo programas.", "fisica matematica tomo programas.", "comicas matematicas tomo programas.", "basicas matematica como programas.", "basicas matematicas como programas.", "basicas matematica como programa.", "basicas matematica como programar.", "basicas matematica tanto programas."

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• Adding a wildcard symbol may retrieve word variants: (("copulas mathematical computer programmers.") OR ("basicas matematica tomo programas."))*.