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"
"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 apis technical papers", "world apps technical papers", "world bank's technical papers", "world bank technical papers", "world back technical papers"
"work banks technical papers" » "work tasks technical papers", "work apis technical papers", "work apps technical papers", "work bank technical papers", "work blacks technical papers", "work back 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: (((("word basics technical paper") OR ("cad basic mechanical paper"))) OR ((("world banks technical papers") OR ("work banks technical papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"word basics technical paper\") or (\"cad basic mechanical paper\"))) or (((\"world banks technical papers\") OR (\"work banks technical papers\"))))".
• Removing quotes may allow a broader search: (((( word basics technical paper ) or ( cad basic mechanical paper ))) or ((( world banks technical papers ) OR ( work banks technical papers )))).
• Adding a wildcard symbol may retrieve word variants: (((("word basics technical paper") or ("cad basic mechanical paper"))) or ((("world banks technical papers") OR ("work banks technical papers"))))*.