Perhaps you should try some spelling variations:
"world across working papers" » "world access working papers", "world class working papers", "world across varying papers", "world cross working papers", "worked across working papers"
"world macros working paper" » "world ratios working paper", "world mac working paper", "world machines working paper", "word macros working paper", "world microbes working paper", "world maps working paper", "world marks working paper", "world macs working paper"
"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 papers" » "world mac working papers", "world avro 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 papers") OR ("world across working papers"))) OR ("world macros working paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world manko working paper\") or (((((\"world macro working papers\") OR (\"world across working papers\"))) or (\"world macros working paper\"))))".
• Removing quotes may allow a broader search: (( world manko working paper ) or ((((( world macro working papers ) OR ( world across working papers ))) or ( world macros working paper )))).
• Adding a wildcard symbol may retrieve word variants: (("world manko working paper") or ((((("world macro working papers") OR ("world across working papers"))) or ("world macros working paper"))))*.