Perhaps you should try some spelling variations:
"world banks technical paper" » "world basics technical paper", "world apis technical paper", "world apps technical paper", "world banks technical papers", "world bank's technical paper", "work banks technical paper", "world back technical paper"
"world tasks technical paper" » "world tasks technical papers", "world cases technical paper", "world classes technical paper"
"world jack technical paper" » "world jack technical papers", "world back technical paper", "world pack technical paper", "world rack technical paper", "world java technical paper", "world packet technical paper", "world attack technical paper"
"world bank technical paper" » "world bank technical papers", "world back technical paper", "world lanka technical paper", "world bands technical paper"

You may be able to get more results by adjusting your search query.

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