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