Perhaps you should try some spelling variations:
literatur oral » literatura oral, literatur moral, literature moral
key literature » grey literature, gray literature, body literature
y literature » y literatura, y literatur, gay literature
a literatur » a literature
159 agenda » 1979 agenda, 1 agenda, 10 agenda
agenda ii » agenda iii, agenda i, agenda iv
benda ii » bamenda ii, eda ii, anda ii
2 benda » 2 bends
ii a » ii _, i a

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( 159 agenda ii a literatur oral ) OR ( 2 benda ii ((y literature) OR (key literature)) arab )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( 159 agenda ii a literatur oral ) or ( 2 benda ii ((y literature) OR (key literature)) arab ))".
• Adding a wildcard symbol may retrieve word variants: (( 159 agenda ii a literatur oral ) or ( 2 benda ii ((y literature) OR (key literature)) arab ))*.