Perhaps you should try some spelling variations:
"deutsches problem key / history / 18th century" » "deutsche probleme key / history / 18th century", "ethisches problem key / history / 18th century", "deutschland probleme key / history / 18th century", "deutsches problems key / history / 18th century", "deutsches problem k / history / 18th century"
"deutsches muster kreuz / history / 18th century" » "deutsches museum kreuz / history / 18th century", "deutsches register kreuz / history / 18th century", "deutschland muster kreuz / history / 18th century", "deutsches muster kreis / history / 18th century", "deutsches uber kreuz / 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" » "deutschen rates kreuzes / history / 18th century", "deutschen rechte kreuzes / history / 18th century", "deutschen rotes 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: (((((((("deutschen roten kreuz / history / 18th century") OR ("deutschen roten kreuzes / history / 18th century"))) OR ("deutsches muster kreuz / history / 18th century"))) OR ("deutsche rote kreuz / history / 18th century"))) OR ("deutsches problem key / history / 18th century")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"deutschen roten kreuz / history / 18th century\") OR (\"deutschen roten kreuzes / history / 18th century\"))) or (\"deutsches muster kreuz / history / 18th century\"))) or (\"deutsche rote kreuz / history / 18th century\"))) or (\"deutsches problem key / history / 18th century\"))".
• Removing quotes may allow a broader search: (((((((( deutschen roten kreuz / history / 18th century ) OR ( deutschen roten kreuzes / history / 18th century ))) or ( deutsches muster kreuz / history / 18th century ))) or ( deutsche rote kreuz / history / 18th century ))) or ( deutsches problem key / history / 18th century )).
• Adding a wildcard symbol may retrieve word variants: (((((((("deutschen roten kreuz / history / 18th century") OR ("deutschen roten kreuzes / history / 18th century"))) or ("deutsches muster kreuz / history / 18th century"))) or ("deutsche rote kreuz / history / 18th century"))) or ("deutsches problem key / history / 18th century"))*.