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 bandar working paper"
"world band working papers" » "world bandes working papers", "world board working papers", "world based working papers", "world brand working papers", "world bank working papers", "world bandar working papers"
"world hand working paper" » "world hard working paper", "world chang working paper", "world und working paper", "world hands working paper", "world hans working paper", "world had working paper"
"world bond working paper" » "world bonds working paper", "world bold working paper", "world bone working paper", "world beyond working paper", "world board working paper", "world blind working paper"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"world band working paper\") OR (\"world hand working paper\"))) OR (\"world band working papers\"))) OR (\"world bond working paper\"))".
• Removing quotes may allow a broader search: (((((( world band working paper ) OR ( world hand working paper ))) OR ( world band working papers ))) OR ( world bond working paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("world band working paper") OR ("world hand working paper"))) OR ("world band working papers"))) OR ("world bond working paper"))*.