Perhaps you should try some spelling variations:
"vassal" » "vassals", "vassil", "vassar"
"vassall" » "vassalsl", "vassill", "vassarl", "vassals", "hassall"
"nassaus" » "nassau", "nassars", "nassauer"
"vassili" » "vassilis", "vassil", "vassiliki"

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: (("vassal" OR "nassaus") OR ("vassili" OR "vassall")).
• Removing quotes may allow a broader search: (( vassal or nassaus ) or ( vassili or vassall )).
• Adding a wildcard symbol may retrieve word variants: (("vassal" or "nassaus") or ("vassili" or "vassall"))*.