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