Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronize swimming", "synchronising swimming"
"synchronism stemming" » "synchronize stemming", "synchronising stemming", "synchronized stemming", "synchronism steering", "synchronism stepping", "synchronism stealing"
"synchronism streaming" » "synchronize streaming", "synchronising streaming", "synchronized streaming", "synchronism treating"
"synchronism flemming" » "synchronize flemming", "synchronising flemming", "synchronized flemming", "synchronism fleming"

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: (("synchronised swimming") OR ((((("synchronism stemming") OR ("synchronism streaming"))) OR ("synchronism flemming"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((((\"synchronism stemming\") OR (\"synchronism streaming\"))) or (\"synchronism flemming\"))))~".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((((( synchronism stemming ) OR ( synchronism streaming ))) or ( synchronism flemming ))))~.
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((((("synchronism stemming") OR ("synchronism streaming"))) or ("synchronism flemming"))))*.