Perhaps you should try some spelling variations:
"competencias matematicas como programar." » "competencia matematica como programar.", "competencias basicas como programar.", "competencias genericas como programar.", "competencias matematica como programar.", "competencias matematicas con programar.", "competencias matematica tomo programar.", "competencias matematicas como programa.", "competencias matematicas campo programa.", "competencias matematicas con programa."
"basicas matematicas computer programming." » "basicas mathematics computer programming.", "basicas matematicas comics programming.", "basicas matematicas computer programs.", "basicas matematicas computer program.", "comicas matematicas computer programming.", "benditas matematicas computer programming.", "fisica matematica computer programming."

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: (("competencias matematicas como programar.") or ("basicas matematicas computer programming."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("competencias matematicas como programar.") OR ("basicas matematicas computer programming.")).
• Removing quotes may allow a broader search: (( competencias matematicas como programar. ) or ( basicas matematicas computer programming. )).
• Adding a wildcard symbol may retrieve word variants: (("competencias matematicas como programar.") or ("basicas matematicas computer programming."))*.