Perhaps you should try some spelling variations:
"World macro working paper" » "World macros working paper", "World avro working paper", "World manko working paper", "World macro working papers"
world macro » word macro, world mark, world mario
"World mac working paper" » "World c working paper", "World macros working paper", "World music working paper", "World mac working papers"
world mac » world map, world may, world max

You may be able to get more results by adjusting your search query.

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