Perhaps you should try some spelling variations:
"world bank's technical paper" » "world bands technical paper", "world bank technical paper", "world banking technical paper"
"world bank's technical papers" » "world bands technical papers", "world bank technical papers", "world banking technical papers"
"world banks technical paper" » "world tasks technical paper", "world basics technical paper", "world apps technical paper", "work banks technical paper", "world back technical paper", "world books technical paper"
"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's technical paper") OR ("world bank's technical papers"))))) 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's technical paper\") OR (\"world bank's technical papers\"))))) or (\"world apis technical paper\"))".
• Removing quotes may allow a broader search: (((( world banks technical paper ) or ((( world bank's technical paper ) OR ( world bank's technical papers ))))) or ( world apis technical paper )).
• Adding a wildcard symbol may retrieve word variants: (((("world banks technical paper") or ((("world bank's technical paper") OR ("world bank's technical papers"))))) or ("world apis technical paper"))*.