Perhaps you should try some spelling variations:
"world bank's technical papers" » "world bands technical papers", "world bank technical papers", "world backups technical papers"
"world basics technical paper" » "world basic technical paper", "world basics techniques paper", "world devices technical paper", "world brics technical paper", "worlds basic technical paper"
"word basics technical paper" » "word basic technical paper", "word basics techniques paper", "word devices technical paper", "world basic technical paper", "bond basics technical paper", "cord basic technical paper"
"world banks technical papers" » "world tasks technical papers", "world apis technical papers", "world apps technical papers", "work banks technical papers", "world back technical papers", "world books technical papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world basics technical paper") OR ("word basics technical paper"))) OR ((("world banks technical papers") OR ("world bank's technical papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world basics technical paper\") or (\"word basics technical paper\"))) or (((\"world banks technical papers\") OR (\"world bank's technical papers\"))))".
• Removing quotes may allow a broader search: (((( world basics technical paper ) or ( word basics technical paper ))) or ((( world banks technical papers ) OR ( world bank's technical papers )))).
• Adding a wildcard symbol may retrieve word variants: (((("world basics technical paper") or ("word basics technical paper"))) or ((("world banks technical papers") OR ("world bank's technical papers"))))*.