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 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"
"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 macro working paper") OR ("world mark working paper"))) OR ("world data working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world macro working paper\") OR (\"world mark working paper\"))) or (\"world data working paper\"))".
• Removing quotes may allow a broader search: (((( world macro working paper ) OR ( world mark working paper ))) or ( world data working paper )).
• Adding a wildcard symbol may retrieve word variants: (((("world macro working paper") OR ("world mark working paper"))) or ("world data working paper"))*.