Perhaps you should try some spelling variations:
"versus discrete ideal" » "versus discrete dead", "versus discrete areas", "versus discrete items"
"dense discrete index" » "inverse discrete index", "dense discrete lindley", "dense discrete wind", "dense discrete ime"
"dense discrete input" » "inverse discrete input"

Try widening your search to All Fields.

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: (("versus discrete ideal") OR ((("dense discrete index") OR ("dense discrete input")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"versus discrete ideal\") or (((\"dense discrete index\") OR (\"dense discrete input\"))))".
• Removing quotes may allow a broader search: (( versus discrete ideal ) or ((( dense discrete index ) OR ( dense discrete input )))).
• Adding a wildcard symbol may retrieve word variants: (("versus discrete ideal") or ((("dense discrete index") OR ("dense discrete input"))))*.