Perhaps you should try some spelling variations:
"programa parallel codigo." » "programa para codigo." (Expand Search)
"problemas al codigo." » "problemas abp codigo." (Expand Search), "problemas pbl codigo." (Expand Search), "problemas de codigo." (Expand Search), "problemas del codigo." (Expand Search)
"programacion visual codigo." » "programacion visudel codigo." (Expand Search)

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

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