Perhaps you should try some spelling variations:
"competencias matematicas computer program." » "competencia matematica computer program.", "competencias basicas computer program.", "competencias genericas computer program.", "competencias mathematics computer program.", "competencias matematicas comics program.", "competencias matematicas computer programs."
"basicas matematicas como programming." » "comicas matematicas como programming.", "benditas matematicas como programming.", "fisica matematica como programming.", "basicas matematica como programming.", "basicas matematicas con programming.", "basicas matematica tomo programming.", "basicas matematicas control programming.", "basicas matematicas logic programming.", "basicas matematicas 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 computer program.") or ("basicas matematicas como programming."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("competencias matematicas computer program.") OR ("basicas matematicas como programming.")).
• Removing quotes may allow a broader search: (( competencias matematicas computer program. ) or ( basicas matematicas como programming. )).
• Adding a wildcard symbol may retrieve word variants: (("competencias matematicas computer program.") or ("basicas matematicas como programming."))*.