Perhaps you should try some spelling variations:
en litterature » et litterature, une litterature, la litterature
do fisiologia » de fisiologia, dlco fisiologia, e fisiologia
fisiologia en » fisiologia e, fisiologia del, fisiologia de
case studies » case study

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: "ratios ((game studies) OR (case studies)) do fisiologia en litterature".
• Adding a wildcard symbol may retrieve word variants: ratios ((game studies) OR (case studies)) do fisiologia en litterature*.