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."
"fisica matematica computer programas." » "fisica mathematics computer programas.", "fisica matematica computer programs.", "fisica matematica computer program.", "fisica matematica computer programming."

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