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

Try widening your search to All Fields.

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