Perhaps you should try some spelling variations:
"world banks technical papers" » "world tasks technical papers", "world basics technical papers", "world aws technical papers", "world bank's technical papers", "world bank technical papers", "world back technical papers"
"work banks technical papers" » "work tasks technical papers", "work basics technical papers", "work aws technical papers", "work bank technical papers", "work blacks technical papers", "work back technical papers"
"world apps technical paper" » "world app technical paper", "world basics technical paper", "world access technical paper"
"world apis technical paper" » "world api technical paper", "world basics technical paper", "world actions technical paper", "world anis technical paper", "world kpis 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 apps technical paper") OR ((("world banks technical papers") OR ("work banks technical papers"))))) OR ("world apis technical paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world apps technical paper\") or (((\"world banks technical papers\") OR (\"work banks technical papers\"))))) or (\"world apis technical paper\"))".
• Removing quotes may allow a broader search: (((( world apps technical paper ) or ((( world banks technical papers ) OR ( work banks technical papers ))))) or ( world apis technical paper )).
• Adding a wildcard symbol may retrieve word variants: (((("world apps technical paper") or ((("world banks technical papers") OR ("work banks technical papers"))))) or ("world apis technical paper"))*.