Perhaps you should try some spelling variations:
"world banks technical paper" » "world tasks technical paper", "world basics technical paper", "world blocks technical paper", "world bank's technical paper", "world bank technical paper", "work banks technical paper"
"world lanka technical papers" » "world albania technical papers", "world uganda technical papers", "world rwanda technical papers", "world bank technical papers", "world lack technical papers", "world lake technical papers"
"world land technical papers" » "world poland technical papers", "world plans technical papers", "world plane technical papers", "world hand technical papers", "world laid technical papers", "world island 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 banks technical paper") OR ((("world lanka technical papers") OR ("world land technical papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world banks technical paper\") or (((\"world lanka technical papers\") OR (\"world land technical papers\"))))".
• Removing quotes may allow a broader search: (( world banks technical paper ) or ((( world lanka technical papers ) OR ( world land technical papers )))).
• Adding a wildcard symbol may retrieve word variants: (("world banks technical paper") or ((("world lanka technical papers") OR ("world land technical papers"))))*.