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