Perhaps you should try some spelling variations:
"ley 137 del 2012" » "ley 137 del 2015", "ley 137 del 2018", "ley 137 del 2016", "ley 1537 del 2012", "ley 1379 del 2012", "ley 135 del 2012", "ley 1375 del 2012", "ley 1378 del 2012", "ley 1437 del 2012"
"ley 1581 de 2012" » "ley 1341 de 2012", "ley 1480 de 2012", "ley 1581 de 2015"
"ley 1581 de 2016" » "ley 1341 de 2016", "ley 1480 de 2016", "ley 1581 de 2015"
"ley 1437 de 2012" » "ley 1480 de 2012", "ley 1448 de 2012", "ley 1437 de 2015"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("ley 1581 de 2012") OR ("ley 1581 de 2016"))) or ((("ley 137 del 2012") or ("ley 1437 de 2012"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ley 1581 de 2012") OR ("ley 1581 de 2016"))) OR ((("ley 137 del 2012") OR ("ley 1437 de 2012")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"ley 1581 de 2012\") OR (\"ley 1581 de 2016\"))) or (((\"ley 137 del 2012\") or (\"ley 1437 de 2012\"))))".
• Removing quotes may allow a broader search: (((( ley 1581 de 2012 ) OR ( ley 1581 de 2016 ))) or ((( ley 137 del 2012 ) or ( ley 1437 de 2012 )))).
• Adding a wildcard symbol may retrieve word variants: (((("ley 1581 de 2012") OR ("ley 1581 de 2016"))) or ((("ley 137 del 2012") or ("ley 1437 de 2012"))))*.