Perhaps you should try some spelling variations:
significant physical » significant medical, significant policy
significant persons » significant regions, significant purpose, significant operating
significant prior » significant pre, significant purpose, 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 prior) OR (significant persons))) OR (significant physical)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((significant prior) OR (significant persons))) or (significant physical))".
• Adding a wildcard symbol may retrieve word variants: ((((significant prior) OR (significant persons))) or (significant physical))*.