Perhaps you should try some spelling variations:
"world back technical paper" » "world back technical papers", "world pack technical paper", "world rack technical paper", "world stack technical paper", "world black technical paper", "world lack technical paper", "world basf technical paper"
"world book technical paper" » "world book technical papers", "world boot technical paper", "world hook technical paper", "world hooks technical paper", "world both technical paper", "old book technical paper", "world body technical paper"
"world jack technical paper" » "world jack technical papers", "world pack technical paper", "world rack technical paper", "world stack technical paper", "world packet technical paper", "world attack technical paper"
"world bank technical paper" » "world bank technical papers", "world lanka technical paper", "world bands technical paper", "world pack technical paper"
"world banks technical paper" » "world banks technical papers", "world tasks technical paper", "world basics technical paper", "world apis technical paper", "world bank's technical paper", "work banks technical paper", "world books 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 back technical paper") OR ("world book technical paper"))) OR ("world jack technical paper"))) OR ((("world bank technical paper") OR ("world banks technical paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"world back technical paper\") OR (\"world book technical paper\"))) or (\"world jack technical paper\"))) or (((\"world bank technical paper\") or (\"world banks technical paper\"))))".
• Removing quotes may allow a broader search: (((((( world back technical paper ) OR ( world book technical paper ))) or ( world jack technical paper ))) or ((( world bank technical paper ) or ( world banks technical paper )))).
• Adding a wildcard symbol may retrieve word variants: (((((("world back technical paper") OR ("world book technical paper"))) or ("world jack technical paper"))) or ((("world bank technical paper") or ("world banks technical paper"))))*.