Perhaps you should try some spelling variations:
"world basics techniques paper" » "world basic techniques paper", "world basic technique paper", "world based techniques paper", "world basics techniques upper", "world basics techniques peter", "world basics techniques pattern", "word basics techniques paper", "world brics techniques paper"
"world basics technical paper" » "world basic technical paper", "world basic technique paper", "world statistics technical paper", "world basics technical papers", "word basics technical paper", "world brics technical paper"
"world banks technical paper" » "world banks technical papers", "world tasks technical paper", "world blocks technical paper", "world apis technical paper", "world bank's technical paper", "world bank technical paper", "work banks technical paper"
"world apps technical paper" » "world apps technical papers", "world app technical paper", "world apis technical paper"

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