I have encounter with an issue and can not find the solution after several days of thinking :(

I set up FreeRadius & Mysql successfully, testing with some account ok, 

but my real case: Lot of my users have more than 1 passwords, 

Example: User: "truongdm" comes with the password "abc123" or the password "123abc" is both ok 

Please help me: How can i set it up? 

- I try to insert serveral records with the same "username" and difference "value" - password- in the "radcheck" table

but at one time, the server accept 1 pair of "username/value" only :( 

- I try to edit the file "users" manually but no help .....

Anyone has had this matter, please help me find the direction! 

Thanks & Best Regards!