Perhaps you should try some spelling variations:
"competencias basicas computer programmers." » "competencias basicas computer programs.", "competencias basicas computers programming.", "competencias basicas computer program.", "competencias basic computer programmers.", "competencias pascal computer programmers.", "competencias business computer programmers."
"basicas mathematics computer programming." » "basicas mathematics computer programs.", "basicas mathematics computer program.", "basicas matematicas computer programming.", "business mathematics computer programming."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("competencias basicas computer programmers.") or ("basicas mathematics computer programming."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("competencias basicas computer programmers.") OR ("basicas mathematics computer programming.")).
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• Adding a wildcard symbol may retrieve word variants: (("competencias basicas computer programmers.") or ("basicas mathematics computer programming."))*.