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

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: (((("inverse discrete input") OR ("versus discrete index"))) OR ("dense discrete index")).
• Removing quotes may allow a broader search: (((( inverse discrete input ) or ( versus discrete index ))) or ( dense discrete index )).
• Adding a wildcard symbol may retrieve word variants: (((("inverse discrete input") or ("versus discrete index"))) or ("dense discrete index"))*.