Perhaps you should try some spelling variations:
imperial career » imperial chamber, imperial paper, imperial case
imperial wars » imperial art, imperial way, imperial rewards
imperial car » imperial case, imperial art, imperial a
imperial war » imperial way, imperial art, imperial a

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: ((((imperial career) OR (imperial car))) OR (((imperial wars) OR (imperial war)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((imperial career) or (imperial car))) or (((imperial wars) OR (imperial war))))".
• Adding a wildcard symbol may retrieve word variants: ((((imperial career) or (imperial car))) or (((imperial wars) OR (imperial war))))*.