Perhaps you should try some spelling variations:
"german official archives" » "german judicial archives", "german municipal archives", "german fluvial archives", "german officials archives", "germany official archives", "germany officials archives", "german official archivs"
"german colonial archive" » "german colonialism archive", "germany colonies archive", "american colonial archive", "german colonial archiv"

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: (("german official archives") OR ("german colonial archive"))*.
• Removing quotes may allow a broader search: (( german official archives ) or ( german colonial archive ))*.