Perhaps you should try some spelling variations:
"world band working paper" » "world bandes working paper", "world board working paper", "world based working paper", "world brand working paper", "world bank working paper", "world bond working paper", "world band working papers"
"world bone working paper" » "world one working paper", "world bonn working paper", "world none working paper", "world bond working paper", "world bone working papers"
"world gone working paper" » "world one working paper", "world none working paper", "world zone working paper", "world money working paper", "world go working paper", "world gone working 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 band working paper") OR ((("world bone working paper") OR ("world gone working paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world band working paper\") or (((\"world bone working paper\") OR (\"world gone working paper\"))))".
• Removing quotes may allow a broader search: (( world band working paper ) or ((( world bone working paper ) OR ( world gone working paper )))).
• Adding a wildcard symbol may retrieve word variants: (("world band working paper") or ((("world bone working paper") OR ("world gone working paper"))))*.