Perhaps you should try some spelling variations:
heard before » held before, hearing before, health before
dead before » read before, death before, held before
care before » made before, were before
case before » cases before, made before

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: "((\"professor bradbrook AND residential ((heard before) OR (dead before))\") or (\"professor bradbrook AND residential ((care before) OR (case before))\"))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"professor bradbrook and residential ((heard before) or (dead before))\\") or (\\"professor bradbrook and residential ((care before) OR (case before))\\"))\"".
• Removing quotes may allow a broader search: (( professor bradbrook and residential ((heard before) or (dead before)) ) or ( professor bradbrook and residential ((care before) OR (case before)) )).