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

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 ((("synchronised stemming") or ((("synchronising stemming") or ((("synchronisations stemming") or ("synchronizations streaming"))))))))) or ("synchronized swimming"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ((("synchronised stemming") OR ((("synchronising stemming") OR ((("synchronisations stemming") OR ("synchronizations streaming"))))))))) OR ("synchronized swimming")).
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ((( synchronised stemming ) or ((( synchronising stemming ) or ((( synchronisations stemming ) or ( synchronizations streaming ))))))))) or ( synchronized swimming )).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ((("synchronised stemming") or ((("synchronising stemming") or ((("synchronisations stemming") or ("synchronizations streaming"))))))))) or ("synchronized swimming"))*.