Perhaps you should try some spelling variations:
"world macros working paper" » "world ratios working paper", "world machines working paper", "world macros recording paper", "word macros working paper", "world macro working paper", "world across working paper", "world mapros working paper", "world mayros working paper", "world maxros working paper", "world macros working papers"
"world manko working paper" » "world macro working paper", "world django working paper", "world manner working paper", "world many working paper", "world make working paper", "world mark working paper", "world manko working papers"
"world mac working paper" » "world music working paper", "world basic working paper", "world map working paper", "world may working paper", "world max working paper", "world mac working papers"
"world c working paper" » "world c working papers"

Try widening your search to All Fields.

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