Perhaps you should try some spelling variations:
"programacion lineal codigo." » "programacion visual codigo." (Expand Search), "programacion del codigo." (Expand Search)
"computacion del codigo." » "comparacion del codigo." (Expand Search), "comparacion de codigo." (Expand Search), "compilacion de codigo." (Expand Search)
"computation a codigo." » "computation _ codigo." (Expand Search), "computacion y codigo." (Expand Search), "computational _ codigo." (Expand Search), "computation al codigo." (Expand Search), "computation el 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: (((("computation a codigo.") OR ("computacion del codigo."))) OR ("programacion lineal codigo."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"computation a codigo.\") OR (\"computacion del codigo.\"))) OR (\"programacion lineal codigo.\"))".
• Removing quotes may allow a broader search: (((( computation a codigo. ) OR ( computacion del codigo. ))) OR ( programacion lineal codigo. )).
• Adding a wildcard symbol may retrieve word variants: (((("computation a codigo.") OR ("computacion del codigo."))) OR ("programacion lineal codigo."))*.