Perhaps you should try some spelling variations:
"ley 1537 de 2012" » "ley 1437 de 2012", "ley 1438 de 2012", "ley 1564 de 2012", "ley 137 de 2012", "ley 1507 de 2012", "ley 15637 de 2012", "ley 15037 de 2012", "ley 15237 de 2012"
"ley 1581 de 2012" » "ley 1341 de 2012", "ley 1480 de 2012"
"ley 153 de 2016" » "ley 1563 de 2016", "ley 1503 de 2016", "ley 1523 de 2016", "ley 2153 de 2016"
"ley 153 de 2015" » "ley 1563 de 2015", "ley 1503 de 2015", "ley 1523 de 2015", "ley 2153 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 1537 de 2012") or ("ley 1581 de 2012"))) or ((("ley 153 de 2016") OR ("ley 153 de 2015"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ley 1537 de 2012") OR ("ley 1581 de 2012"))) OR ((("ley 153 de 2016") OR ("ley 153 de 2015")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"ley 1537 de 2012\") or (\"ley 1581 de 2012\"))) or (((\"ley 153 de 2016\") OR (\"ley 153 de 2015\"))))".
• Removing quotes may allow a broader search: (((( ley 1537 de 2012 ) or ( ley 1581 de 2012 ))) or ((( ley 153 de 2016 ) OR ( ley 153 de 2015 )))).
• Adding a wildcard symbol may retrieve word variants: (((("ley 1537 de 2012") or ("ley 1581 de 2012"))) or ((("ley 153 de 2016") OR ("ley 153 de 2015"))))*.