Perhaps you should try some spelling variations:
"world bank's technical paper" » "world bands technical paper", "world bank technical paper", "world banking technical paper", "world bank's technical papers"
"world banks technical paper" » "world tasks technical paper", "world basics technical paper", "world apps technical paper", "world banks technical papers", "work banks technical paper", "world books technical paper", "worlds banken technical paper"
"world back technical paper" » "world back technical papers", "world bank technical paper", "world pack technical paper", "world rack technical paper", "world black technical paper", "world jack technical paper", "world lack technical paper"
"world apis technical paper" » "world apis technical papers", "world api technical paper", "world apps technical paper", "world basics technical paper", "world anis technical paper", "world kpis 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 back technical paper"))) OR ("world bank's technical paper"))) OR ("world apis technical paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"world banks technical paper\") OR (\"world back technical paper\"))) or (\"world bank's technical paper\"))) or (\"world apis technical paper\"))".
• Removing quotes may allow a broader search: (((((( world banks technical paper ) OR ( world back technical paper ))) or ( world bank's technical paper ))) or ( world apis technical paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("world banks technical paper") OR ("world back technical paper"))) or ("world bank's technical paper"))) or ("world apis technical paper"))*.