Cannot post string "union select" php form

Hi .. hope someone will help
i am trying to figure it out why i cannot post string "union select"
every time i try to post data which content union and select ..
the page doesn't get posted and it shows error page not found on this
server
i googled and found some people use union and select to hack sites
(mysql injection)
i guess the server i am using has some kind of filter and if a post
string content "union select"
... it simply doesn't post them and shows error .. (am i correct ???)
i don't know realy whats really wrong and even if it's possible that
server have some kind of filter how can i post everything (including
union select) without getting page not found error
please reply
thank to everyone
.

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