Perhaps you should try some spelling variations:
"world banks technical paper" » "world tasks technical paper", "world basics technical paper", "world apps technical paper", "world bank's technical paper", "world bank technical paper", "work banks technical paper"
"world apis technical paper" » "world api technical paper", "world apps technical paper", "world basics technical paper", "world anis technical paper", "world kpis technical paper"
"world apis technical papers" » "world api technical papers", "world apps technical papers", "world basics technical papers", "world anis technical papers", "world kpis technical papers"
"world mali technical paper" » "world ii technical paper", "world iii technical paper", "world i technical paper", "world marie technical paper", "world malte technical paper", "world mario 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 apis technical paper") OR ("world apis technical papers"))) OR ("world mali technical paper")))).
• Removing quotes may allow a broader search: (( world banks technical paper ) or ((((( world apis technical paper ) or ( world apis technical papers ))) or ( world mali technical paper )))).
• Adding a wildcard symbol may retrieve word variants: (("world banks technical paper") or ((((("world apis technical paper") or ("world apis technical papers"))) or ("world mali technical paper"))))*.