Perhaps you should try some spelling variations:
"ley 42 de 1994 - colombia - comentarios" » "ley 42 de 1995 - colombia - comentarios" (Expand Search), "ley 42 de 1999 - colombia - comentarios" (Expand Search), "ley 42 de 1998 - colombia - comentarios" (Expand Search), "ley 40 de 1994 - colombia - comentarios" (Expand Search), "ley 41 de 1994 - colombia - comentarios" (Expand Search), "ley 12 de 1994 - colombia - comentarios" (Expand Search), "ley 142 de 1994 - colombia - comentarios" (Expand Search), "ley 22 de 1994 - colombia - comentarios" (Expand Search)
"ley 42 de 1991 - colombia - comentarios" » "ley 40 de 1991 - colombia - comentarios" (Expand Search), "ley 41 de 1991 - colombia - comentarios" (Expand Search), "ley 12 de 1991 - colombia - comentarios" (Expand Search), "ley 142 de 1991 - colombia - comentarios" (Expand Search), "ley 22 de 1991 - colombia - comentarios" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("ley 42 de 1994 - colombia - comentarios") OR ("ley 42 de 1991 - colombia - comentarios"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ley 42 de 1994 - colombia - comentarios\") OR (\"ley 42 de 1991 - colombia - comentarios\"))".
• Removing quotes may allow a broader search: (( ley 42 de 1994 - colombia - comentarios ) OR ( ley 42 de 1991 - colombia - comentarios )).
• Adding a wildcard symbol may retrieve word variants: (("ley 42 de 1994 - colombia - comentarios") OR ("ley 42 de 1991 - colombia - comentarios"))*.