Perhaps you should try some spelling variations:
"fisica mathematics computer programmers." » "fisica mathematics computer programs.", "fisica mathematics computer programming.", "fisica mathematics computers programming.", "fisica matematica computer programmers.", "fisico matematicas computer programmers.", "design mathematics computer programmers."
"fisico matematica como programa." » "fisico matematicas como programa.", "fisica matematica como programa.", "logico matematica como programa.", "fisico matematicas con programa.", "fisico matematica como problema."

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: (("fisico matematica como programa.") or ("fisica mathematics computer programmers."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("fisico matematica como programa.") OR ("fisica mathematics computer programmers.")).
• Removing quotes may allow a broader search: (( fisico matematica como programa. ) or ( fisica mathematics computer programmers. )).
• Adding a wildcard symbol may retrieve word variants: (("fisico matematica como programa.") or ("fisica mathematics computer programmers."))*.