Perhaps you should try some spelling variations:
"world apis technical paper" » "world apis technical papers", "world apps technical paper", "world basics technical paper", "world anis technical paper", "world kpis technical paper", "world aprils technical paper", "world appss technical paper"
"world api technical paper" » "world api technical papers", "world mali technical paper", "world ii technical paper", "world iii technical paper", "world app technical paper", "world april technical paper", "world apps technical paper"
"world ai technical paper" » "world ai technical papers", "world ii technical paper", "world i technical paper", "world mali technical paper", "world a technical paper"

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• Adding a wildcard symbol may retrieve word variants: (("world apis technical paper") OR ((("world api technical paper") OR ("world ai technical paper"))))*.