Perhaps you should try some spelling variations:
"germany colonial empire" » "german colonial empire", "germany colonies empire", "germany ecological empire"
"germany colonial empires" » "german colonial empires", "germany colonies empires", "germany ecological empires"

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: (("germany colonial empire") OR ("germany colonial empires")).
• Removing quotes may allow a broader search: (( germany colonial empire ) or ( germany colonial empires )).
• Adding a wildcard symbol may retrieve word variants: (("germany colonial empire") or ("germany colonial empires"))*.