Perhaps you should try some spelling variations:
swash » slash, swath, awash
smash » slash
spat » spam, spamt
spa » spam
span » spamn, spin
spanier » spamnier, spinier, spanien
stamer » stammer
-plate » -plates, -place

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: ((swash OR smash) OR ((((spat OR spa) OR span) OR spot) OR (spanier OR stamer)))-plate.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((swash or smash) or ((((spat OR spa) or span) or spot) or (spanier or stamer)))-plate".
• Adding a wildcard symbol may retrieve word variants: ((swash or smash) or ((((spat OR spa) or span) or spot) or (spanier or stamer)))-plate*.