Perhaps you should try some spelling variations:
bother discussion » other discussion, mothers discussion, other discussions
discussion papers » discussion paper, discussion part, discussion panel
mother discussion » other discussion, other discussions, others discussion
worlds mother » worlds other, world other, world's other
world bother » world other, world both, world better

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: (( world bother discussion papers ) OR ( worlds mother discussion papers )).
• Adding a wildcard symbol may retrieve word variants: (( world bother discussion papers ) or ( worlds mother discussion papers ))*.