Perhaps you should try some spelling variations:
"world attacks technical paper" » "world stack technical paper", "world tasks technical paper", "world attack technique paper", "world attacks technical papers", "world attack technical paper", "bold attacks technical paper", "worm attacks technical paper"
"word basics technical paper" » "word basic technical paper", "word basics techniques paper", "word basic technique paper", "word basics technical papers", "world basic technical paper", "bond basics technical paper", "cord basic technical paper"

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 attacks technical paper") OR ("word basics technical paper")).
• Removing quotes may allow a broader search: (( world attacks technical paper ) or ( word basics technical paper )).
• Adding a wildcard symbol may retrieve word variants: (("world attacks technical paper") or ("word basics technical paper"))*.