Perhaps you should try some spelling variations:
"world basics technical paper" » "world basic technical paper", "world basics techniques paper", "world basic technique paper", "world brics technical paper", "worlds basic technical paper"
"word basics technical paper" » "word basic technical paper", "word basics techniques paper", "word basic technique paper", "world basic technical paper", "bond basics technical paper", "cord basic technical paper"
"world lanka technical papers" » "world banks technical papers", "world land technical papers", "world albania technical papers", "world lack technical papers", "world lake technical papers"
"world bank technical papers" » "world banks technical papers", "world back technical papers", "world bands technical papers"

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