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