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", "work banks technical paper", "world back technical paper"
"world bands technical paper" » "world pandas technical paper", "world bars technical paper", "world bases technical paper", "world hands technical paper", "world bank's technical paper", "world bandar technical paper"
"world bank technical paper" » "world lanka technical paper", "world pack technical paper", "world rack technical paper"
"world bank technical papers" » "world lanka technical papers", "world pack technical papers", "world rack technical papers"
"world apis technical paper" » "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 bank technical paper") OR ("world bank technical papers"))) OR ("world bands 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 bank technical paper\") OR (\"world bank technical papers\"))) or (\"world bands technical paper\"))))) or (\"world apis technical paper\"))".
• Removing quotes may allow a broader search: (((( world banks technical paper ) or ((((( world bank technical paper ) OR ( world bank technical papers ))) or ( world bands technical paper ))))) or ( world apis technical paper )).
• Adding a wildcard symbol may retrieve word variants: (((("world banks technical paper") or ((((("world bank technical paper") OR ("world bank technical papers"))) or ("world bands technical paper"))))) or ("world apis technical paper"))*.