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 macro working paper", "world across working paper", "world macros working papers"
"world data working paper" » "world a working paper", "world data working papers"

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 macros working paper") OR ("world data working paper")).
• Removing quotes may allow a broader search: (( world macros working paper ) or ( world data working paper )).
• Adding a wildcard symbol may retrieve word variants: (("world macros working paper") or ("world data working paper"))*.