Perhaps you should try some spelling variations:
significant purpose » significant persons, significant pre
significant medical » significant indicator
significant policy » significant points
significant prior » significant pre, significant persons, significant points

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: ((((significant policy) OR (((significant prior) OR (significant purpose))))) OR (((significant physical) OR (significant medical)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((significant policy) or (((significant prior) OR (significant purpose))))) or (((significant physical) or (significant medical))))".
• Adding a wildcard symbol may retrieve word variants: ((((significant policy) or (((significant prior) OR (significant purpose))))) or (((significant physical) or (significant medical))))*.