Perhaps you should try some spelling variations:
"programacion a codigo." » "programacion _ codigo." (Expand Search), "programacion de codigo." (Expand Search), "programacion en codigo." (Expand Search), "programacion el codigo." (Expand Search)
"programar plc codigo." » "programable plc codigo." (Expand Search), "programa la codigo." (Expand Search), "programar el codigo." (Expand Search)
"programa al codigo." » "programa del codigo." (Expand Search), "programa de codigo." (Expand Search), "programa la codigo." (Expand Search)

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: (("programar plc codigo.") OR ((("programacion a codigo.") OR ("programa al codigo."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"programar plc codigo.\") OR (((\"programacion a codigo.\") OR (\"programa al codigo.\"))))".
• Removing quotes may allow a broader search: (( programar plc codigo. ) OR ((( programacion a codigo. ) OR ( programa al codigo. )))).
• Adding a wildcard symbol may retrieve word variants: (("programar plc codigo.") OR ((("programacion a codigo.") OR ("programa al codigo."))))*.