Perhaps you should try some spelling variations:
"exactas matematicas computer programs." » "exactas mathematics computer programs.", "exactas matematicas como programs.", "exactas matematicas comics programs.", "exactas matematicas computer programas.", "exactas matematicas computer programa."
"basicas matematicas computer program." » "basicas mathematics computer program.", "basicas matematicas como program.", "basicas matematicas comics program.", "comicas matematicas computer program.", "benditas matematicas computer program.", "fisica matematica computer program."

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