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