Perhaps you should try some spelling variations:
"World manko working paper" » "World django working paper", "World manner working paper", "World manual working paper"
"world manko working papers" » "world django working papers", "world manner working papers", "world manual working papers", "world many working papers", "world make working papers", "world mark working papers"
"World macro working paper" » "World macros working paper", "World mac working paper", "World avro working paper"
world macro » word macro, world mark, world mac

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