Perhaps you should try some spelling variations:
"3 regulatory perspectives" » "3 regulatory perspective", "3 regulatory peptides", "law regulatory perspectives", "3 regulation perspectives"
"key regulatory properties" » "key regularity properties", "key regular properties", "key regulatory processes", "key regulator properties", "key regulators properties", "4 regulatory properties"
"_ regulatory properties" » "_ regularity properties", "_ regular properties", "_ regulatory processes", "_ regulation properties"
"a regulatory properties" » "a regularity properties", "a regular properties", "a regulatory processes"
"key regulatory proteins" » "key regulator proteins", "key regulators proteins", "4 regulatory proteins", "key regulatory protein"

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: (((("key regulatory properties") OR ("key regulatory proteins"))) OR ((((("_ regulatory properties") OR ("3 regulatory perspectives"))) OR ("a regulatory properties")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"key regulatory properties\") OR (\"key regulatory proteins\"))) or (((((\"_ regulatory properties\") or (\"3 regulatory perspectives\"))) or (\"a regulatory properties\"))))".
• Removing quotes may allow a broader search: (((( key regulatory properties ) OR ( key regulatory proteins ))) or ((((( _ regulatory properties ) or ( 3 regulatory perspectives ))) or ( a regulatory properties )))).
• Adding a wildcard symbol may retrieve word variants: (((("key regulatory properties") OR ("key regulatory proteins"))) or ((((("_ regulatory properties") or ("3 regulatory perspectives"))) or ("a regulatory properties"))))*.