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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("synchronised swimming") or ("synchronising swimming"))) or ((((("synchronised stemming") or ((("synchronized stemming") OR ("synchronized streaming"))))) or ("synchronize stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ("synchronising swimming"))) OR ((((("synchronised stemming") OR ((("synchronized stemming") OR ("synchronized streaming"))))) OR ("synchronize stemming")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") or (\"synchronising swimming\"))) or (((((\"synchronised stemming\") or (((\"synchronized stemming\") OR (\"synchronized streaming\"))))) or (\"synchronize stemming\"))))".
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ( synchronising swimming ))) or ((((( synchronised stemming ) or ((( synchronized stemming ) OR ( synchronized streaming ))))) or ( synchronize stemming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ("synchronising swimming"))) or ((((("synchronised stemming") or ((("synchronized stemming") OR ("synchronized streaming"))))) or ("synchronize stemming"))))*.