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"
"synchronised streaming" » "synchronism streaming", "synchronize streaming", "synchronised treating"
"synchronising swimming" » "synchronizing swimming", "synchronism swimming", "synchronisations swimming"

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