Perhaps you should try some spelling variations:
administration reforms » administration reform, administrative reforms, administrative reform
administration regime » administration review, administrative region, administration reform
mines imperial » kings imperial, sizes imperial, chinese imperial
hon mines » iron mines, hon daines, when mines

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "hon mines imperial ((administration regime) OR (administration reforms)) of china".
• Adding a wildcard symbol may retrieve word variants: hon mines imperial ((administration regime) OR (administration reforms)) of china*.