You Should Have Known was created on 2009-11-02.
I Should Have Known It was created in 2010.
I Should Have Known Better was created on 1964-07-13.
I Should Have Known Better - Jim Diamond song - was created on 1984-10-26.
Freedom from the Known was created in 1969.
Back to the Known was created in 1985.
Let It Be Known was created in 1988.
The Known World was created in 2003-09.
The sentence "You should of known better" derives from "You should've known better"; "should of" sounds about like the way you say "should've".Of course "should've" is a contraction of "should have" - consequently it is correct to say either "You should have known better" or (being a bit informal) "You should've known better" but it is incorrect to WRITE "You should of known better" instead of "You should've known better."
That Should Be Me was created in 2010.
Should I Do It was created in 1981.
Wild Animals I Have Known was created in 1898.
I Who Have Never Known Men was created in 1995.