Perhaps you should try some spelling variations:
"world bicssc technical paper" » "world basic technical paper", "world tcsc technical paper", "world css technical paper", "works bicssc technical paper", "work bicssc technical paper"
"cad basic mechanical paper" » "cad basic mechanisms paper", "cad basic mechanism paper", "cad dynamic mechanical paper", "cad basic mechanical proper", "cad basic mechanical power", "cad basic mechanical powers", "ipad basic mechanical paper", "land basic mechanical paper", "cord basic mechanical paper"
"world banks technical papers" » "world tasks technical papers", "world basics technical papers", "world blocks technical papers", "world bank's technical papers", "world bank technical papers", "work banks 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 bicssc technical paper") OR ("cad basic mechanical paper"))) OR ("world banks technical papers")).
• Removing quotes may allow a broader search: (((( world bicssc technical paper ) or ( cad basic mechanical paper ))) or ( world banks technical papers )).
• Adding a wildcard symbol may retrieve word variants: (((("world bicssc technical paper") or ("cad basic mechanical paper"))) or ("world banks technical papers"))*.