Perhaps you should try some spelling variations:
"competencias basicas computer programmers." » "competencias basicas computer programs.", "competencias basicas computer programming.", "competencias basicas computers programming.", "competencias basic computer programmers.", "competencias pascal computer programmers.", "competencias business computer programmers."
"basicas mathematics computer programas." » "basicas matematicas computer programas.", "business mathematics computer programas.", "basicas mathematics computer programs.", "basicas mathematics computer program.", "basicas mathematics computer programming."

You may be able to get more results by adjusting your search query.

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