sql server 2008 - How do I join tables on multiple conditions -

i have select data 2 tables using join both working individual not working together, when execute complete query not work when execute both joins individually example:

select  dbo.mail_messages.subject, dbo.mail_messages.body, dbo.mail_messages.date, dbo.mail_messages.messageid --dbo.mail_messages.parrentid dbo.mail_messages join dbo.mail_reply mr1 on mr1.messageid = dbo.mail_messages.messageid 

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select  dbo.mail_messages.subject, dbo.mail_messages.body, dbo.mail_messages.date, dbo.mail_messages.messageid dbo.mail_messages join dbo.mail_reply mr2 on mr2.parrentid = dbo.mail_messages.messageid 

above queries work fine.

but when execute below query (combination of above queries) returns nothing.

select  dbo.mail_messages.subject, dbo.mail_messages.body, dbo.mail_messages.date, dbo.mail_messages.messageid --dbo.mail_messages.parrentid dbo.mail_messages join dbo.mail_reply mr1 on mr1.messageid = dbo.mail_messages.messageid join dbo.mail_reply mr2 on mr2.parrentid = dbo.mail_messages.messageid 

i have attached image:

i think need filter according message id or parentid , return status of message

select distinct t1.*  mail_reply t2 join mail_messages t1 on (t2.[message id]=t1.[message id] or t2.parentid=t1.[message id]) 

now if want filter message id or parentid append code below code

and (t2.[message id]=2 or t2.parentid=2) 

now if want filter message id or parentid , userid append code below code

and (t2.[message id]=2 or t2.parentid=2) , t2.userid=1