Perhaps you should try some spelling variations:
"deutsches problem kaluza / history / 18th century" » "deutsche probleme kaluza / history / 18th century", "ethisches problem kaluza / history / 18th century", "deutschland probleme kaluza / history / 18th century", "deutsches problem kalai / history / 18th century", "deutsches problem kalman / history / 18th century", "deutsches problem karush / history / 18th century"
"ethische probleme kaluza / history / 18th century" » "methodische probleme kaluza / history / 18th century", "ethische probleme klug / history / 18th century"
"deutsches roten kreuz / history / 18th century" » "deutsches rotes kreuz / history / 18th century", "deutsches patent kreuz / history / 18th century", "deutsches leben kreuz / history / 18th century", "deutsches roten kreuzes / history / 18th century"
"deutschen roten kreuz / history / 18th century" » "deutschen rates kreuz / history / 18th century", "deutschen rechte kreuz / history / 18th century", "deutschen rotes kreuz / history / 18th century", "deutschen roten kreuzes / history / 18th century"

Try widening your search to All Fields.

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: (((((("deutsches roten kreuz / history / 18th century") OR ("deutschen roten kreuz / history / 18th century"))) OR ("deutsche rote kreuz / history / 18th century"))) OR ((("deutsches problem kaluza / history / 18th century") OR ("ethische probleme kaluza / history / 18th century")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"deutsches roten kreuz / history / 18th century\") OR (\"deutschen roten kreuz / history / 18th century\"))) or (\"deutsche rote kreuz / history / 18th century\"))) or (((\"deutsches problem kaluza / history / 18th century\") or (\"ethische probleme kaluza / history / 18th century\"))))".
• Removing quotes may allow a broader search: (((((( deutsches roten kreuz / history / 18th century ) OR ( deutschen roten kreuz / history / 18th century ))) or ( deutsche rote kreuz / history / 18th century ))) or ((( deutsches problem kaluza / history / 18th century ) or ( ethische probleme kaluza / history / 18th century )))).
• Adding a wildcard symbol may retrieve word variants: (((((("deutsches roten kreuz / history / 18th century") OR ("deutschen roten kreuz / history / 18th century"))) or ("deutsche rote kreuz / history / 18th century"))) or ((("deutsches problem kaluza / history / 18th century") or ("ethische probleme kaluza / history / 18th century"))))*.