Perhaps you should try some spelling variations:
"deutsches problem kreuz / history / 18th century" » "deutsche probleme kreuz / history / 18th century", "ethisches problem kreuz / history / 18th century", "deutschland probleme kreuz / history / 18th century", "deutsches problem keun / history / 18th century", "deutsches problem kaluza / history / 18th century", "deutsches problem key / history / 18th century"
"deutsches rotes kreuz / history / 18th century" » "deutschen roten kreuz / history / 18th century", "deutsches modell kreuz / history / 18th century", "deutsches muster kreuz / history / 18th century", "deutsches roten kreuz / history / 18th century", "deutsches roten kreuzes / history / 18th century"
"deutsche rote kreuz / history / 18th century" » "deutschen roten kreuz / history / 18th century"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("deutsches rotes kreuz / history / 18th century") OR ("deutsche rote kreuz / history / 18th century"))) OR ("deutsches problem kreuz / history / 18th century")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"deutsches rotes kreuz / history / 18th century\") OR (\"deutsche rote kreuz / history / 18th century\"))) or (\"deutsches problem kreuz / history / 18th century\"))".
• Removing quotes may allow a broader search: (((( deutsches rotes kreuz / history / 18th century ) OR ( deutsche rote kreuz / history / 18th century ))) or ( deutsches problem kreuz / history / 18th century )).
• Adding a wildcard symbol may retrieve word variants: (((("deutsches rotes kreuz / history / 18th century") OR ("deutsche rote kreuz / history / 18th century"))) or ("deutsches problem kreuz / history / 18th century"))*.