Perhaps you should try some spelling variations:
"world manner working paper" » "world manager working paper", "world banners working paper", "world inner working paper", "world manned working paper", "world anne working paper"
"world matter working paper" » "world matters working paper", "world master working paper", "world pattern working paper", "world better working paper", "world market working paper", "world made working paper"
"world manko working paper" » "world django working paper", "world manual working paper", "world also working paper", "world many working paper", "world make working paper", "world mark working paper"
"world macro working papers" » "world macros working papers", "world mac working papers", "world across working papers", "word macro working papers", "world mark 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 manner working paper") OR ("world matter working paper"))))) OR ("world macro working papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world manko working paper\") or (((\"world manner working paper\") OR (\"world matter working paper\"))))) or (\"world macro working papers\"))".
• Removing quotes may allow a broader search: (((( world manko working paper ) or ((( world manner working paper ) OR ( world matter working paper ))))) or ( world macro working papers )).
• Adding a wildcard symbol may retrieve word variants: (((("world manko working paper") or ((("world manner working paper") OR ("world matter working paper"))))) or ("world macro working papers"))*.