Perhaps you should try some spelling variations:
"competencias matematicas computer programming." » "competencia matematica computer programming.", "competencias basicas computer programming.", "competencias genericas computer programming.", "competencias matematicas como programming.", "competencias matematicas comics programming.", "competencias matematicas computer programs.", "competencias matematicas computer program."
"basicas mathematics computer programa." » "basicas matematicas computer programa.", "business mathematics computer programa.", "basicas mathematics computer programs.", "basicas mathematics computer program.", "basicas mathematics computer programmers."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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