Perhaps you should try some spelling variations:
"key regulatory perspectives" » "key regulatory perspective", "key regulatory peptides", "key regulator perspectives", "key regulators perspectives", "3 regulatory perspectives"
"a regulatory properties" » "a regularity properties", "a regulatory proteins", "a regulatory processes"
"a regular properties" » "a regularity properties", "a molecular properties"

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: (("key regulatory perspectives") OR ((("a regulatory properties") OR ("a regular properties"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"key regulatory perspectives\") or (((\"a regulatory properties\") OR (\"a regular properties\"))))*".
• Removing quotes may allow a broader search: (( key regulatory perspectives ) or ((( a regulatory properties ) OR ( a regular properties ))))*.