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

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world back technical paper") OR ("world back technical papers"))) OR ("world bands technical paper"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world back technical paper\") OR (\"world back technical papers\"))) or (\"world bands technical paper\"))*".
• Removing quotes may allow a broader search: (((( world back technical paper ) OR ( world back technical papers ))) or ( world bands technical paper ))*.