Perhaps you should try some spelling variations:
"when generative syntax" » "when enumerative syntax", "when generalized syntax", "when generative system", "where generative syntax", "within generative syntax"
"when generating system" » "when generating systems", "when generation system", "when generation systems", "ideen generating system", "token generating system", "gson generating system"

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: (("when generative syntax") OR ("when generating system")).
• Removing quotes may allow a broader search: (( when generative syntax ) or ( when generating system )).
• Adding a wildcard symbol may retrieve word variants: (("when generative syntax") or ("when generating system"))*.