Perhaps you should try some spelling variations:
"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 bother discussion papers", "world south discussion papers", "world growth discussion papers"
"world both discussion part" » "world bother discussion part", "world south discussion part", "world growth discussion part", "world both discussion paper"

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