Perhaps you should try some spelling variations:
bell theater » bell heather, real theater, bell theorem
film theater » im theater, film chapter
der theater » oder theater, des theater, oper theater
dem theater » das theater, im theater

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: (( pen/laura ((der theater) OR (dem theater)) avant ) OR ( pen/laura ((bell theater) OR (film theater)) part )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( pen/laura ((der theater) or (dem theater)) avant ) or ( pen/laura ((bell theater) OR (film theater)) part ))".
• Adding a wildcard symbol may retrieve word variants: (( pen/laura ((der theater) or (dem theater)) avant ) or ( pen/laura ((bell theater) OR (film theater)) part ))*.