Perhaps you should try some spelling variations:
"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 bank's technical paper" » "world banks technical paper", "world bands technical paper", "world banking technical paper", "world bank's technical papers"
"world back technical paper" » "world back technical papers", "world pack technical paper", "world rack technical paper", "world backup technical paper", "world black technical paper", "world jack technical paper", "world lack technical paper"
"world bank technical paper" » "world bank technical papers", "world banks technical paper", "world lanka technical paper", "world bands technical paper"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("world basics technical paper") OR ("world bank's technical paper"))) OR ("world back technical paper"))) OR ("world bank technical paper")).
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• Adding a wildcard symbol may retrieve word variants: (((((("world basics technical paper") or ("world bank's technical paper"))) or ("world back technical paper"))) or ("world bank technical paper"))*.