Perhaps you should try some spelling variations:
"open regenerative systems" » "open generative systems", "open degenerate systems", "open cooperative systems", "upon regenerative systems", "non regenerative systems", "die regenerative systems"
"open regenerative syntax" » "open generative syntax", "open regenerative system", "open regenerative central", "upon regenerative syntax", "non regenerative syntax", "die regenerative syntax"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"open regenerative syntax\") OR (\"open regenerative systems\"))".
• Removing quotes may allow a broader search: (( open regenerative syntax ) OR ( open regenerative systems )).
• Adding a wildcard symbol may retrieve word variants: (("open regenerative syntax") OR ("open regenerative systems"))*.