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 apps technical paper", "world basics technical paper", "world actions technical paper", "world anis technical paper", "world kpis technical paper", "world ais technical paper", "world aprils technical paper"
"world apis technical papers" » "world apps technical papers", "world basics technical papers", "world actions technical papers", "world anis technical papers", "world kpis technical papers", "world ais technical papers", "world aprils technical papers"
"world api technical paper" » "world mali technical paper", "world ii technical paper", "world iii technical paper", "world ai technical paper", "world app technical paper", "world april 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 api technical paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world banks technical paper\") or (((((\"world apis technical paper\") OR (\"world apis technical papers\"))) or (\"world api 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 api 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 api technical paper"))))*.