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