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