Perhaps you should try some spelling variations:
"programable plc codigo." » "programar plc codigo." (Expand Search), "programable al codigo." (Expand Search), "programable el codigo." (Expand Search)
"programacion a codigo." » "programacion _ codigo." (Expand Search), "programacion de codigo." (Expand Search), "programacion en codigo." (Expand Search), "programacion al codigo." (Expand Search), "programacion el codigo." (Expand Search)
"programas del codigo." » "programas de codigo." (Expand Search), "programa del codigo." (Expand Search), "programa de 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: (("programacion a codigo.") OR ((("programas del codigo.") OR ("programable plc codigo."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"programacion a codigo.\") OR (((\"programas del codigo.\") OR (\"programable plc codigo.\"))))".
• Removing quotes may allow a broader search: (( programacion a codigo. ) OR ((( programas del codigo. ) OR ( programable plc codigo. )))).
• Adding a wildcard symbol may retrieve word variants: (("programacion a codigo.") OR ((("programas del codigo.") OR ("programable plc codigo."))))*.