Perhaps you should try some spelling variations:
"key regulatory properties" » "key regular properties", "key regulatory perspectives", "key regulatory processes", "key regulator properties", "key regulators properties", "3 regulatory properties"
"a regulatory properties" » "a regular properties", "a regulatory perspectives", "a regulatory processes"
"3 regularity properties" » "3 security properties", "_ regularity properties", "a regularity properties", "3 regular properties"
"key regulatory proteins" » "key regulator proteins", "key regulators proteins", "3 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 ((("3 regularity properties") 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 (((\"3 regularity properties\") or (\"a regulatory properties\"))))".
• Removing quotes may allow a broader search: (((( key regulatory properties ) OR ( key regulatory proteins ))) or ((( 3 regularity properties ) or ( a regulatory properties )))).
• Adding a wildcard symbol may retrieve word variants: (((("key regulatory properties") OR ("key regulatory proteins"))) or ((("3 regularity properties") or ("a regulatory properties"))))*.