Perhaps you should try some spelling variations:
"world macro working paper" » "world macros working paper", "world mac working paper", "world avro working paper", "word macro working paper", "world mark working paper"
"world data working papers" » "world a 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 macro working paper") OR ("world data working papers")).
• Removing quotes may allow a broader search: (( world macro working paper ) or ( world data working papers )).
• Adding a wildcard symbol may retrieve word variants: (("world macro working paper") or ("world data working papers"))*.