Perhaps you should try some spelling variations:
"world banks technical paper" » "world tasks technical paper", "world basics technical paper", "world apps technical paper", "world banks technical papers", "world bank's technical paper", "work banks technical paper", "world back technical paper"
"world bank technical paper" » "world bank technical papers", "world lanka technical paper", "world bands technical paper", "world pack 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 april technical paper"
"world kpis technical paper" » "world kpis technical papers", "world apps technical paper", "world gis technical paper", "world clis technical paper", "world kris technical paper", "world kids technical paper", "world kim 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 bank technical paper"))) OR ((("world apis technical paper") OR ("world kpis technical paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world banks technical paper\") or (\"world bank technical paper\"))) or (((\"world apis technical paper\") OR (\"world kpis technical paper\"))))".
• Removing quotes may allow a broader search: (((( world banks technical paper ) or ( world bank technical paper ))) or ((( world apis technical paper ) OR ( world kpis technical paper )))).
• Adding a wildcard symbol may retrieve word variants: (((("world banks technical paper") or ("world bank technical paper"))) or ((("world apis technical paper") OR ("world kpis technical paper"))))*.