Perhaps you should try some spelling variations:
"world devices technical paper" » "world services technical paper", "world policies technical paper", "world devices electrical paper", "world device technical paper", "hold devices technical paper"
"world banks technical papers" » "world tasks technical papers", "world basics technical papers", "world apps technical papers", "world bank's technical papers", "world bank technical papers", "work banks technical papers"
"world apis technical papers" » "world apps technical papers", "world basics technical papers", "world actions technical papers", "world anis technical papers", "world kpis technical papers", "world ais technical papers", "world aprils technical papers"
"world api technical papers" » "world mali technical papers", "world ii technical papers", "world iii technical papers", "world ai technical papers", "world app technical papers", "world april technical papers"

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 devices technical paper") OR ((("world banks technical papers") OR ((("world apis technical papers") OR ("world api technical papers")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world devices technical paper\") or (((\"world banks technical papers\") or (((\"world apis technical papers\") OR (\"world api technical papers\"))))))".
• Removing quotes may allow a broader search: (( world devices technical paper ) or ((( world banks technical papers ) or ((( world apis technical papers ) OR ( world api technical papers )))))).
• Adding a wildcard symbol may retrieve word variants: (("world devices technical paper") or ((("world banks technical papers") or ((("world apis technical papers") OR ("world api technical papers"))))))*.