Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
game studies » case studies
de filologia » di filologia, de filosofia, e fisiologia
e filologia » di filologia, e fisiologia, e filosofia
rats game » rts game, rate game, ratios game

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "rats game studies ((e filologia) OR (de filologia)) de litterature".
• Adding a wildcard symbol may retrieve word variants: rats game studies ((e filologia) OR (de filologia)) de litterature*.