Perhaps you should try some spelling variations:
"principles some" » "principles single", "principles study"
"princely states" » "principal states", "provinces states", "principles states"
"princely state" » "principles state"

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: (((("princely state") OR ("principles some"))) OR ("princely states")).
• Removing quotes may allow a broader search: (((( princely state ) or ( principles some ))) or ( princely states )).
• Adding a wildcard symbol may retrieve word variants: (((("princely state") or ("principles some"))) or ("princely states"))*.