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"
"ipad basic mechanical paper" » "ipad basic mechanisms paper", "ipad basic mechanism paper", "ipad dynamic mechanical paper", "ipad basic mechanical proper", "ipad basic mechanical power", "ipad basic mechanical powers", "ipad basics mechanical paper"
"world banks technical papers" » "world tasks technical papers", "world apps technical papers", "world aws technical papers", "world bank's technical papers", "world bank technical papers", "work banks technical papers"
"world apis technical papers" » "world api technical papers", "world apps technical papers", "world anis technical papers", "world kpis 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 ("ipad basic mechanical paper"))) OR ((("world banks technical papers") OR ("world apis technical papers")))).
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• Adding a wildcard symbol may retrieve word variants: (((("word basics technical paper") or ("ipad basic mechanical paper"))) or ((("world banks technical papers") or ("world apis technical papers"))))*.