Perhaps you should try some spelling variations:
"prime ministers of czechoslovakia" » "prime minister of czechoslovakia"
"time minister of Czechoslovakia" » "prime minister of Czechoslovakia", "some ministers of Czechoslovakia", "late minister of Czechoslovakia"

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: (("time minister of Czechoslovakia") OR ("prime ministers of czechoslovakia")).
• Removing quotes may allow a broader search: (( time minister of Czechoslovakia ) or ( prime ministers of czechoslovakia )).
• Adding a wildcard symbol may retrieve word variants: (("time minister of Czechoslovakia") or ("prime ministers of czechoslovakia"))*.