Perhaps you should try some spelling variations:
"world macros working papers" » "world machines working papers", "world macros recording papers", "word macros working papers", "world across working papers", "world microbes working papers", "world marks working papers", "world macs working papers"
"world manko working paper" » "world django working paper", "world manner working paper", "world manual working paper", "world many working paper", "world make working paper", "world mark working paper"
"world macro working paper" » "world mac working paper", "world across working paper", "world macro blocking paper", "word macro working paper", "world mark working paper"
"world macro working papers" » "world mac working papers", "world across working papers", "world macro blocking papers", "word macro working papers", "world mark 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 manko working paper") OR ((("world macro working paper") OR ((("world macro working papers") OR ("world macros 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 macro working papers\") OR (\"world macros working papers\"))))))".
• Removing quotes may allow a broader search: (( world manko working paper ) or ((( world macro working paper ) or ((( world macro working papers ) OR ( world macros working papers )))))).
• Adding a wildcard symbol may retrieve word variants: (("world manko working paper") or ((("world macro working paper") or ((("world macro working papers") OR ("world macros working papers"))))))*.