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", "world bank technical paper", "world back technical paper"
"work banks technical paper" » "work tasks technical paper", "work basics technical paper", "work apps technical paper", "work banks technical papers", "work bank technical paper", "work blacks technical paper", "work back 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 kpis 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 ("work banks technical paper"))) OR ("world apis 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 (\"work banks technical paper\"))) or (\"world apis technical paper\"))) or (\"world pack technical paper\"))".
• Removing quotes may allow a broader search: (((((( world banks technical paper ) OR ( work banks technical paper ))) or ( world apis technical paper ))) or ( world pack technical paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("world banks technical paper") OR ("work banks technical paper"))) or ("world apis technical paper"))) or ("world pack technical paper"))*.