Perhaps you should try some spelling variations:
"german colonialism empire" » "german colonial empire", "german colonialism emerges", "german colonialism part", "germany coloniesism empire", "american colonialism empire"
"german colonial empires" » "germany colonies empires", "american colonial empires"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"german colonialism empire\") OR (\"german colonial empires\"))".
• Removing quotes may allow a broader search: (( german colonialism empire ) OR ( german colonial empires )).
• Adding a wildcard symbol may retrieve word variants: (("german colonialism empire") OR ("german colonial empires"))*.