documentclass[a4paper,onesided,12pt]{report}

usepackage{styles/fbe_tez}
usepackage[utf8x]{inputenc} % To use Unicode (e.g. Turkish) characters
renewcommand{labelenumi}{(roman{enumi})}
usepackage{amsmath, amsthm, amssymb}
 % Some extra symbols
usepackage[bottom]{footmisc}
usepackage{cite}
usepackage{graphicx}
usepackage{longtable}
usepackage{multirow}
usepackage{subfigure}
usepackage{algorithm}
usepackage{algorithmic}
newlength{mycolumnwidth}
setlength{mycolumnwidth}{textwidth-9cm-4tabcolsep}

begin{longtable}{|m{9cm}|m{mycolumnwidth}|}
caption{Tarık's emergent codes and corresponding themes}\
toprule
 RELEVANT CODES &   THEME \
 toprule
 endfirsthead

caption{Tarık's emergent codes and corresponding themes (continued)}\
toprule
RELEVANT CODES &   THEME \
hline
endhead

Graph representation & multirow{1}{*}{Interpretation of graph} \
Graph completion & \
midrule
Thinking about quadratic functions & \
Thinking about quadratic functions in real life
& multirow{1}{*}{Interpretation of function} \
Thinking about quadratic functions in physics & \
midrule
Finding a satisfactory answer to what question requires
&multirow{1}{*}{Make sense of model repr.}  \
midrule
pagebreak
Looking interaction between his drawn model and given graph
&multirow{1}{*}{Alignment of model-graph} \
Finding conflict when matching his graph and his  model & \
bottomrule

end{longtable}

end{document}