Perhaps you should try some spelling variations:
"world apis technical paper" » "world apis technical papers", "world api technical paper", "world apps technical paper", "world basics technical paper", "world anis technical paper", "world kpis technical paper"
"world lake technical paper" » "world lake technical papers", "world large technical paper", "world plane technical paper", "world game technical paper", "world make technical paper", "world taken technical paper"
"world take technical paper" » "world take technical papers", "world game technical paper", "world page technical paper", "world face technical paper", "world taken technical paper", "world make technical paper", "world trade technical paper"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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