Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronising swimming"
"synchronize swimming" » "synchronizing swimming"
"synchronized swimming" » "synchronizingd swimming"
"synchronism stemming" » "synchronising stemming", "synchronism streaming", "synchronism steering", "synchronism flemming"

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