Perhaps you should try some spelling variations:
"inverse discrete index" » "inverse distance index", "versus discrete index", "inverse discrete input", "inverse discrete ideal", "inverse discrete wind"
"dense discrete lindley" » "dense discrete lines", "dense discrete cylinder", "dense discrete linear"
"dense discrete line" » "dense discrete sine", "dense discrete linear", "dense discrete cosine"

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