Get sql_text's executed by another user !

 Hi all,

   I want view sql was executed by another user, I use bellow scipt:

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   select sesion.sid,

       sesion.username,

       optimizer_mode,

       hash_value,

       address,

       cpu_time,

       elapsed_time,

       sql_text

  from v$sqlarea sqlarea, v$session sesion

 where sesion.sql_hash_value = sqlarea.hash_value

   and sesion.sql_address    = sqlarea.address

   and sesion.username is not null

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   But in the sql_text, content of sql not enough ! Seem as it was cutted ! Ex: original content is abc123 --> after elect it has value is abc.

   Are there some methods that I can view completely sql text ?