Perhaps you should try some spelling variations:
"competencias matematicas computer programs." » "competencia matematica computer programs.", "competencias basicas computer programs.", "competencias genericas computer programs.", "competencias matematicas como programs.", "competencias matematicas comics programs.", "competencias matematicas computer programas.", "competencias matematicas computer programa."
"basicas mathematics computer programmers." » "basicas mathematics computer programming.", "basicas mathematics computers programming.", "basicas mathematics computer program.", "basicas matematicas computer programmers.", "business mathematics computer programmers."

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