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