Perhaps you should try some spelling variations:
"world apis technical paper" » "world api technical paper", "world apps technical paper", "world basics technical paper", "world kpis technical paper", "world april technical paper"
"world anis technical paper" » "world acids technical paper", "world banks technical paper", "world bands technical paper", "world angus technical paper", "world ai technical paper", "world anti technical paper"
"world anis technical papers" » "world acids technical papers", "world banks technical papers", "world bands technical papers", "world angus technical papers", "world ai technical papers", "world anti 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 apis technical paper") OR ((("world anis technical paper") OR ("world anis technical papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world apis technical paper\") or (((\"world anis technical paper\") OR (\"world anis technical papers\"))))".
• Removing quotes may allow a broader search: (( world apis technical paper ) or ((( world anis technical paper ) OR ( world anis technical papers )))).
• Adding a wildcard symbol may retrieve word variants: (("world apis technical paper") or ((("world anis technical paper") OR ("world anis technical papers"))))*.