Perhaps you should try some spelling variations:
"vassal" » "vassall", "vassil", "vassar"
"vassals" » "vassalls", "vassils", "vassars", "vassilis"
"vassars" » "vassar", "nassars", "vassalos"
"vassart" » "vassar", "massart", "assart"

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 ("vassals" OR ("vassars" OR "vassart"))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(\"vassal\" or (\"vassals\" or (\"vassars\" OR \"vassart\")))".
• Removing quotes may allow a broader search: ( vassal or ( vassals or ( vassars OR vassart ))).
• Adding a wildcard symbol may retrieve word variants: ("vassal" or ("vassals" or ("vassars" OR "vassart")))*.