Perhaps you should try some spelling variations:
"world bother discussion papers" » "world mother discussion papers", "world other discussion papers", "world mothers discussion papers", "world bother discussion paper", "world bother discussion panel", "world better discussion papers", "worlds other discussion papers"
"world book discussion papers" » "world book discussion paper", "world book discussion panel", "world work discussion papers", "world livebook discussion papers", "world bank discussion papers", "old book discussion papers", "world body discussion papers"
"world shock discussion papers" » "world shock discussion paper", "world shock discussion panel", "world short discussion papers", "world work discussion papers", "world stock discussion papers", "world shook discussion papers", "world stocks discussion papers"
"world both discussion papers" » "world both discussion paper", "world both discussion panel", "world south discussion papers", "world growth discussion papers", "world fourth discussion papers"
"world shock discussion part" » "world short discussion part", "world work discussion part", "world shock discussion paper", "world stock discussion part", "world shook discussion part", "world stocks discussion part"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world book discussion papers") OR ((("world shock discussion papers") OR ("world shock discussion part"))))) OR ((("world both discussion papers") OR ("world bother discussion papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world book discussion papers\") or (((\"world shock discussion papers\") or (\"world shock discussion part\"))))) or (((\"world both discussion papers\") OR (\"world bother discussion papers\"))))".
• Removing quotes may allow a broader search: (((( world book discussion papers ) or ((( world shock discussion papers ) or ( world shock discussion part ))))) or ((( world both discussion papers ) OR ( world bother discussion papers )))).
• Adding a wildcard symbol may retrieve word variants: (((("world book discussion papers") or ((("world shock discussion papers") or ("world shock discussion part"))))) or ((("world both discussion papers") OR ("world bother discussion papers"))))*.