Missing part of my graphics

Hi there,
I'm using tikz for my master's thesis in computer science. Right now I'm
drawing some trees and I let them grow in different directions e.g. using
'child [grow=right]'. My problem is that some parts of my tree disappear. It
might be because there is an origin in the upper left corner and when I make
the tree grow upwards, it grows out of the "paper"? Any ideas? Thanks

Here's my code:

\documentclass{minimal}
\usepackage{tikz}
\usetikzlibrary{positioning,arrows}

\begin{document}

\begin{tikzpicture}
\tikzstyle vertex=[circle,draw,fill=black,inner sep=1pt]

\tikz[scale=0.8]{
\node (r) [vertex] {}
    child [grow=left]{ node (c1) [vertex] {}
      child{ node (c11) [vertex] {} }
      child{ node (c12) [vertex] {} }
      child{ node (c13) [vertex] {} }
    }
    child { node (c2) [vertex] {} }
    child [grow=right]{ node (c3) [vertex] {} 
      child [grow=right]{ node (c31) [vertex] {} 
        child{ node (c311) [vertex] {} }
        child{ node (c312) [vertex] {} }
      }
      child [grow=up]{ node (c32) [vertex] {}
        child{ node (c321) [vertex] {} }
        child{ node (c322) [vertex] {} }
      }
    }
;
}

\hspace{2 cm}

\tikz[scale=0.8]{
\node (r) [vertex] {}
    child { node (c1) [vertex] {}
      child{ node (c11) [vertex] {} }
      child{ node (c12) [vertex] {} }
      child{ node (c13) [vertex] {} }
    }
    child { node (c2) [vertex] {} }
    child { node (c3) [vertex] {} 
      child { node (c31) [vertex] {} 
        child{ node (c311) [vertex] {} }
        child{ node (c312) [vertex] {} }
      }
      child { node (c32) [vertex] {} }
    }
;
}
\end{tikzpicture}

\end{document}

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