Perhaps you should try some spelling variations:
"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 macs working paper", "world marios working paper", "world macros working papers"
"world across working paper" » "world access working paper", "world class working paper", "world across varying paper", "world cross working paper", "worked across working paper", "world across working papers"
"world macro working paper" » "world mac working paper", "world avro working paper", "world manko working paper", "word macro working paper", "world mario working paper", "world macro working papers"
"world mark working paper" » "world dark working paper", "world market working paper", "world markup working paper", "world map working paper", "world may working paper", "world mark working papers"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("world mark working paper") OR ((("world macro working paper") OR ((("world macros working paper") OR ("world across working paper")))))).
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