Perhaps you should try some spelling variations:
"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 book discussion part" » "world book discussion paper", "world work discussion part", "world shock discussion part", "world livebook discussion part", "world bank discussion part", "old book discussion part", "world body discussion part"

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 book discussion part") OR ("world both discussion papers")).
• Removing quotes may allow a broader search: (( world book discussion part ) or ( world both discussion papers )).
• Adding a wildcard symbol may retrieve word variants: (("world book discussion part") or ("world both discussion papers"))*.