Perhaps you should try some spelling variations:
"world brand working paper" » "world branch working paper", "world board working paper", "world beyond working paper", "world bank working paper", "old brand working paper"
"word brand working paper" » "word branch working paper", "word board working paper", "word beyond working paper", "word grand working paper", "good brand working paper", "old brand working paper"
"world band working paper" » "world bandes working paper", "world board working paper", "world based working paper", "world bank working paper", "world bond working paper", "world hand working paper"
"world band working papers" » "world bandes working papers", "world board working papers", "world based working papers", "world bank working papers", "world bond working papers", "world hand 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 band working papers"))) OR ((("world brand working paper") OR ("word brand working paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world band working paper\") or (\"world band working papers\"))) or (((\"world brand working paper\") OR (\"word brand working paper\"))))".
• Removing quotes may allow a broader search: (((( world band working paper ) or ( world band working papers ))) or ((( world brand working paper ) OR ( word brand working paper )))).
• Adding a wildcard symbol may retrieve word variants: (((("world band working paper") or ("world band working papers"))) or ((("world brand working paper") OR ("word brand working paper"))))*.