Perhaps you should try some spelling variations:
"non-overlapping registers" » "non-overlapping clusters", "non-overlapping regions", "non-overlapping regulatory"
"non-overlapping matrix" » "non-overlapping metrics", "non-overlapping matches", "non-overlapping data"

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: (("non-overlapping registers") OR ("non-overlapping matrix")).
• Removing quotes may allow a broader search: (( non-overlapping registers ) or ( non-overlapping matrix )).
• Adding a wildcard symbol may retrieve word variants: (("non-overlapping registers") or ("non-overlapping matrix"))*.