Perhaps you should try some spelling variations:
american colonial » american colonies, american colonization
colonies exposed » colonies exploded, clones exposed, colonies composed
colonial empire » colonial empires
colonies empire » colonial empires, colonialism empire

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: "((\"american colonial empire\") or (\"american ((((colonies empire) OR (colonies exposed))) OR (coloured empire))\"))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"american colonial empire\\") or (\\"american ((((colonies empire) OR (colonies exposed))) or (coloured empire))\\"))\"".
• Removing quotes may allow a broader search: (( american colonial empire ) or ( american ((((colonies empire) OR (colonies exposed))) or (coloured empire)) )).