Perhaps you should try some spelling variations:
"world bandes working paper" » "world banners working paper", "world ranges working paper", "world panes working paper", "world aedes working paper", "world bandar working paper", "world banks working paper", "world brandes working paper", "world bondes working paper", "world handes working paper", "world bandes working papers"
"world bank's working paper" » "world banners working paper", "world bank's work paper", "world books working paper", "world bank's working papers"
"world bankes working paper" » "world banners working paper", "world ranges working paper", "world panes working paper", "world banks working paper", "worlds banken working paper", "world makes working paper", "world bankes working papers"
"world band working paper" » "world board working paper", "world based working paper", "world hard working paper", "world brand working paper", "world bond working paper", "world hand working paper", "world band working papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("world band working paper") OR ((((("world bandes working paper") OR ("world bank's working paper"))) OR ("world bankes working paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world band working paper\") or (((((\"world bandes working paper\") OR (\"world bank's working paper\"))) or (\"world bankes working paper\"))))".
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• Adding a wildcard symbol may retrieve word variants: (("world band working paper") or ((((("world bandes working paper") OR ("world bank's working paper"))) or ("world bankes working paper"))))*.