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