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

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