Perhaps you should try some spelling variations:
"world mothers discussion papers" » "world mother discussion papers", "world others discussion papers", "world other discussion papers", "world mothers discussion paper", "world mothers discussion part", "world mothers discussion panel", "world matters discussion papers", "world modelers discussion papers"
"world both discussion papers" » "world both discussion paper", "world both discussion part", "world both discussion panel", "world south discussion papers", "world growth discussion papers", "world fourth discussion papers"
"world bother discussion papers" » "world bother discussion paper", "world bother discussion part", "world bother discussion panel", "world mother discussion papers", "world other discussion papers", "world other discussions papers", "world better discussion papers", "worlds other discussion papers"

Try widening your search to All Fields.

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 both discussion papers") OR ((("world bother discussion papers") OR ("world mothers discussion papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world both discussion papers\") or (((\"world bother discussion papers\") OR (\"world mothers discussion papers\"))))".
• Removing quotes may allow a broader search: (( world both discussion papers ) or ((( world bother discussion papers ) OR ( world mothers discussion papers )))).
• Adding a wildcard symbol may retrieve word variants: (("world both discussion papers") or ((("world bother discussion papers") OR ("world mothers discussion papers"))))*.