Perhaps you should try some spelling variations:
"fisica matematica computer programs." » "fisica mathematics computer programs.", "fisica matematica computer programa."
"basicas matematicas comics programas." » "comicas matematicas comics programas.", "benditas matematicas comics programas.", "fisico matematicas comics programas.", "basicas matematicas como programas.", "basicas mathematics comic programas.", "basicas matematicas economico programas.", "basicas matematicas teorias programas.", "basicas matematicas los programas.", "basicas matematicas como programa."

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