Perhaps you should try some spelling variations:
"competencias mathematics computer programmers." » "competencias matematicas computer programmers.", "competencias matematica computer programmers.", "competencia matematica computer programmers.", "competencias mathematics computer programs.", "competencias mathematics computer programming.", "competencias mathematics computers programming."
"basicas matematicas computer programas." » "basicas matematicas como programas.", "basicas matematicas comics programas.", "comicas matematicas computer programas.", "benditas matematicas computer programas.", "fisica matematica computer programas.", "basicas matematicas computer programs.", "basicas matematicas computer program.", "basicas matematicas computer programming."

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• Adding a wildcard symbol may retrieve word variants: (("competencias mathematics computer programmers.") or ("basicas matematicas computer programas."))*.