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

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