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

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