Perhaps you should try some spelling variations:
"world actions technical paper" » "world functions technical paper", "world practices technical paper", "world solutions technical paper", "world actions technical papers", "world auctions technical paper", "world action technical paper", "world fictions technical paper"
"world basics technical paper" » "world basic technical paper", "world basics techniques paper", "world basic technique paper", "world basics technical papers", "word basics technical paper", "world brics technical paper"
"world apis technical paper" » "world apis technical papers", "world api technical paper", "world anis technical paper", "world kpis technical paper", "world april technical paper"
"world apps technical paper" » "world apps technical papers", "world app technical paper"

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