Perhaps you should try some spelling variations:
"20-gute manager series" » "20-gute manager queries", "20-gute manager server", "20-gute manager service", "20-late manager series", "20-game manager series", "20-minute manager series"
"20-site manager series" » "20-site manager queries", "20-site manager server", "20-site manager service", "20-state manager series", "20-file manager series", "20-wie manager series"

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: (("20-gute manager series") OR ("20-site manager series")).
• Removing quotes may allow a broader search: (( 20-gute manager series ) or ( 20-site manager series )).
• Adding a wildcard symbol may retrieve word variants: (("20-gute manager series") or ("20-site manager series"))*.