Perhaps you should try some spelling variations:
slash » flash, clash, slabsh, seash, sash
slas » slabs, seas, sas
sheath » heath
seat » set, seit, sea
spat » span, spot, spam
-plate" » -place"
plates" » places"

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: "((slash OR slas) OR ((sheath OR (seat OR satz)) OR spat))(-plate" or -plates").
• Removing quotes may allow a broader search: ((slash or slas) or ((sheath or (seat or satz)) or spat))(-plate or -plates ).
• Adding a wildcard symbol may retrieve word variants: "((slash or slas) or ((sheath or (seat or satz)) or spat))(-plate" or -plates")*.