Perhaps you should try some spelling variations:
"world banking technical paper" » "world binding technical paper", "world linking technical paper", "world making technical paper", "world banking technical papers", "world ranking technical paper", "world blinking technical paper"
"world banks technical paper" » "world tasks technical paper", "world basics technical paper", "world blocks technical paper", "world banks technical papers", "world bank's technical paper", "work banks technical paper", "world books technical paper"
"world back technical paper" » "world back technical papers", "world pack technical paper", "world rack technical paper", "world backup technical paper", "world black technical paper", "world jack technical paper", "world lack technical paper"
"world bank technical paper" » "world bank technical papers", "world lanka technical paper", "world bands technical paper", "world pack technical paper"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("world banks technical paper") OR ("world banking technical paper"))) OR ("world back technical paper"))) OR ("world bank technical paper")).
• Removing quotes may allow a broader search: (((((( world banks technical paper ) or ( world banking technical paper ))) or ( world back technical paper ))) or ( world bank technical paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("world banks technical paper") or ("world banking technical paper"))) or ("world back technical paper"))) or ("world bank technical paper"))*.