Perhaps you should try some spelling variations:
"world banks technical paper" » "world tasks technical paper", "world basics technical paper", "world apis 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 back technical paper", "world bands technical paper", "world rack technical paper"
"world lanka technical paper" » "world lanka technical papers", "world land technical paper", "world albania technical paper", "world uganda technical paper", "world lack technical paper", "world lake technical paper", "world lara technical paper"
"world pack technical paper" » "world pack technical papers", "world back technical paper", "world rack technical paper", "world stack technical paper", "world packet technical paper", "world peace technical paper", "world place 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 lanka technical paper"))) OR ("world pack 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 lanka technical paper\"))) or (\"world pack technical paper\"))))".
• Removing quotes may allow a broader search: (( world banks technical paper ) or ((((( world bank technical paper ) OR ( world lanka technical paper ))) or ( world pack technical paper )))).
• Adding a wildcard symbol may retrieve word variants: (("world banks technical paper") or ((((("world bank technical paper") OR ("world lanka technical paper"))) or ("world pack technical paper"))))*.