Perhaps you should try some spelling variations:
"ley 1537 de 2012" » "ley 1438 de 2012", "ley 1564 de 2012", "ley 1562 de 2012", "ley 153 de 2012", "ley 1507 de 2012", "ley 1530 de 2012", "ley 1537 de 2015", "ley 1537 de 2016"
"ley 1581 de 2012" » "ley 1341 de 2012", "ley 1480 de 2012", "ley 1581 de 2015", "ley 1581 de 2016"
"ley 1437 de 2012" » "ley 1480 de 2012", "ley 1448 de 2012", "ley 1437 de 2015", "ley 1437 de 2016"
"ley 1030 de 2012" » "ley 100 de 2012", "ley 1010 de 2012", "ley 130 de 2012", "ley 1030 de 2015", "ley 1030 de 2016", "ley 1330 de 2012"
"ley 1090 de 2012" » "ley 100 de 2012", "ley 1098 de 2012", "ley 1480 de 2012", "ley 1090 de 2015", "ley 1090 de 2016"
"ley 137 de 2012" » "ley 137 de 2015", "ley 137 de 2016", "ley 1379 de 2012", "ley 135 de 2012", "ley 13 de 2012", "ley 1377 de 2012", "ley 137 del 2012", "ley 1376 de 2012"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((((((("ley 1537 de 2012") OR ("ley 137 de 2012"))) OR ("ley 1581 de 2012"))) OR ("ley 1437 de 2012"))) OR ((("ley 1030 de 2012") OR ("ley 1090 de 2012"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"ley 1537 de 2012\") or (\"ley 137 de 2012\"))) or (\"ley 1581 de 2012\"))) or (\"ley 1437 de 2012\"))) or (((\"ley 1030 de 2012\") OR (\"ley 1090 de 2012\"))))~".
• Removing quotes may allow a broader search: (((((((( ley 1537 de 2012 ) or ( ley 137 de 2012 ))) or ( ley 1581 de 2012 ))) or ( ley 1437 de 2012 ))) or ((( ley 1030 de 2012 ) OR ( ley 1090 de 2012 ))))~.
• Adding a wildcard symbol may retrieve word variants: (((((((("ley 1537 de 2012") or ("ley 137 de 2012"))) or ("ley 1581 de 2012"))) or ("ley 1437 de 2012"))) or ((("ley 1030 de 2012") OR ("ley 1090 de 2012"))))*.